A Synopsis of Riccardia

Aneuraceae, Marchantiophyta — 261 accepted species

Riccardia Gray, Nat. Arr. Brit. Pl. 1: 683. 1821, nom. cons. (Gray 1821)
- =Roemeria Raddi, Jungermanniogr. Etrusca: 35. 1818, nom. illeg. (Yano & Gradstein 1997)
- =Gymnomitrion Huebener, Hepaticol. Germ.: 37. 1834, nom. illeg. (Grolle 1983)
- =Sarcomitrium Corda, Deutschl. Fl., Abt. II, Cryptog. 26–27: 119. 1835. (Yano & Gradstein 1997)
- =Pseudoneura Gottsche, Mexik. Leverm.: 259. 1863. (Yano & Gradstein 1997)
- =Spinella Schiffn., Forschungsr. Gazelle 4: 41. 1889[1890]. (Schiffner 1889; Yano & Gradstein 1997)
Riccardia aberrans (Steph.) Gradst., J. Hattori Bot. Lab. 45: 129. 1979. (Gradstein & Hekking 1979)

Basionym: Aneura aberrans Steph., Hedwigia 32: 18. 1893. (Stephani 1893; Gradstein & Reeb 2018b)
Riccardia aequicellularis (Steph.) Hewson, Proc. Linn. Soc. New South Wales 95: 79. 1970. (Hewson 1970)

Basionym: Aneura aequicellularis Steph., J. & Proc. Roy. Soc. New South Wales 48: 95. 1914. (Stephani & Watts 1914; Brown & Braggins 1989)
- =Jungermannia multifida var. minima Hook. f. & Taylor, Fl. Antarct. 1: 167. 1845. (Brown & Braggins 1989) ≡Aneura multifida var. minima (Hook. f. & Taylor) Gottsche, Lindenb. & Nees, Syn. Hepat.: 498. 1846.
- =Aneura filiformis Steph., Sp. Hepat. (Stephani) 6: 26. 1917. (Brown & Braggins 1989)
- =Riccardia reducta R.M. Schust., J. Hattori Bot. Lab. 26: 294. 1963. (Brown & Braggins 1989)
Riccardia aequitexta (Steph.) E.A. Br., J. Hattori Bot. Lab. 66: 78. 1989. (Brown & Braggins 1989)

Basionym: Aneura aequitexta Steph., J. Linn. Soc., Bot. 29: 263. 1892. (Stephani 1892; Brown & Braggins 1989)
- =Aneura oppositiflora Steph., J. Linn. Soc., Bot. 29: 265. 1892. (Brown & Braggins 1989)
- =Aneura effusa Steph., Sp. Hepat. (Stephani) 6: 25. 1917. (Brown & Braggins 1989) ≡Riccardia effusa (Steph.) E.A. Hodgs., Trans. Roy. Soc. New Zealand, Bot. 3: 93. 1965. (Brown & Braggins 1989)
Riccardia aeruginosa Furuki, J. Hattori Bot. Lab. 70: 345. 1991. (Furuki 1991)
Riccardia agumana Hewson, Proc. Linn. Soc. New South Wales 95: 82. 1970. (Hewson 1970)
Riccardia alba (Colenso) E.A. Br., J. Hattori Bot. Lab. 66: 66. 1989. (Brown & Braggins 1989)

Basionym: Aneura alba Colenso, Trans. & Proc. New Zealand Inst. 16: 357. 1884. (Colenso 1884; Brown & Braggins 1989)
- =Aneura crispa Colenso, Trans. & Proc. New Zealand Inst. 18: 252. 1886. (Colenso 1886; Brown & Braggins 1989) ≡Riccardia crispa (Colenso) E.A. Hodgs., Trans. Roy. Soc. New Zealand, Bot. 3(4): 90. 1965, nom. illeg. ≡Riccardia novae-zelandiae Hamlin, Rec. Domin. Mus. 8: 148. 1973. (Brown & Braggins 1989)
- =Aneura samoana Steph., Hedwigia 32: 25. 1893. (Söderström et al. 2011b) ≡Riccardia samoana (Steph.) H.A. Mill., Ark. Bot., n.s. 5: 528. 1963.
- =Aneura vitiensis Steph., Hedwigia 32: 28. 1893. (Brown & Braggins 1989) ≡Riccardia vitiensis (Steph.) E.O. Campb., J. Roy. Soc. New Zealand 1: 24. 1971. (Campbell 1971; Söderström et al. 2011b)
Riccardia albomarginata (Steph.) Schiffn., Consp. Hepat. Arch. Ind.: 53. 1898. (Schiffner 1898)

Basionym: Aneura albomarginata Steph., Hedwigia 32: 18. 1893. (Stephani 1893)
Riccardia alcicornis (Hook. f. & Taylor) Trevis., Mem. Reale Ist. Lombardo Sci., Ser. 3, Cl. Sci. Mat. 4: 431. 1877. (Trevisan de Saint-Léon 1877)

Basionym: Jungermannia alcicornis Hook. f. & Taylor, London J. Bot. 3: 479. 1844. (Hooker & Taylor 1844)

≡Aneura alcicornis (Hook. f. & Taylor) Taylor & Hook. f. ex Gottsche, Lindenb. & Nees, Syn. Hepat.: 499. 1846. (Gottsche et al. 1844; Brown & Braggins 1989) ≡Sarcomitrium alcicorne (Hook. f. & Taylor) Mitt., Fl. Tasman. 2: 240. 1859.
- =Aneura subnigra Steph., Kongl. Svenska Vetensk. Acad. Handl., n.s. 46(9): 9. 1911. (Brown & Braggins 1989)
- =Riccardia christophersenii S.W. Arnell, Results Norweg. Sci. Exped. Tristan da Cunha 42: 28. 1958. (Arnell 1958; Váňa & Engel 2013)
Riccardia amnicola Hässel, Revista Mus. Argent. Ci. Nat., Bernardino Rivadavia Inst. Nac. Invest. Ci. Nat., Bot. 4(1): 92. 1972. (Hässel de Menéndez 1972)
Riccardia angustata Horik., J. Sci. Hiroshima Univ., Ser. B, Div. 2, Bot. 2: 156. 1934. (Horikawa 1934)
Riccardia angustealata (Steph.) Hewson, Proc. Linn. Soc. New South Wales 95: 111. 1970. (Hewson 1970)

Basionym: Aneura angustealata Steph., Sp. Hepat. (Stephani) 6: 20. 1917. (Stephani 1925)
Riccardia angusticosta (Steph.) Grolle, J. Hattori Bot. Lab. 36: 550. 1972[1973]. (Grolle 1972; Reeb & Gradstein 2020)

Basionym: Aneura angusticosta Steph., Denkschr. Kaiserl. Akad. Wiss., Wien Math.-Naturwiss. Kl. 88: 724. 1913. (Brunnthaler 1913; Reeb & Gradstein 2020)
- =Aneura stephanii Besch., Rev. Bryol. 20: 60. 1893. (Reeb & Gradstein 2020) ≡Riccardia stephanii (Besch.) E.W. Jones, Trans. Brit. Bryol. Soc. 3: 81. 1956, nom. illeg.
- =Aneura congoana Steph., Sp. Hepat. (Stephani) 6: 23. 1917. (Reeb & Gradstein 2020) ≡Riccardia congoana (Steph.) Demaret, Bull. Jard. Bot. État Bruxelles 16: 306. 1942.
- =Aneura travisiana Pearson, Mem. & Proc. Manchester Lit. Soc. 65: 1. 1921. (Reeb & Gradstein 2020)
- =Riccardia capensis S.W. Arnell, Bot. Not. 1952: 148. 1952. (Arnell 1952; Reeb & Gradstein 2020)
Riccardia angustissima (Steph.) H.A. Mill., Phytologia 47: 323. 1981. (Miller 1981)

Basionym: Aneura angustissima Steph., Sp. Hepat. (Stephani) 6: 20. 1917. (Stephani 1925)
Riccardia arcuata Furuki, J. Hattori Bot. Lab. 70: 361. 1991. (Furuki 1991)
Riccardia argentolimbata Hewson & Grolle, J. Hattori Bot. Lab. 29: 70. 1966. (Grolle 1966b)
Riccardia aspera (Steph.) Grolle, J. Hattori Bot. Lab. 30: 117. 1967. (Grolle 1967)

Basionym: Aneura aspera Steph., Sp. Hepat. (Stephani) 6: 21. 1917. (Stephani 1925)
Riccardia asperulata R.M. Schust., J. Hattori Bot. Lab. 27: 209. 1964. (Schuster 1964)
Riccardia attenuata (Steph.) H.A. Mill., Ark. Bot., n.s. 5: 527. 1963. (Miller 1963; Staples & Imada 2006)

Basionym: Aneura attenuata Steph., Bull. Herb. Boissier 5: 844. 1897. (Stephani 1897)
Riccardia australis (Lehm.) Hewson, Proc. Linn. Soc. New South Wales 95: 110. 1970. (Hewson 1970; Söderström et al. 2016)

Basionym: Sarcomitrium australe Lehm., Nov. Stirp. Pug. 10: 19. 1857. (Lehmann 1857)

≡Aneura australis (Lehm.) Steph., Hedwigia 32(3): 137. 1893, nom. illeg. ≡Riccardia exilis E.A. Br., J. Hattori Bot. Lab. 66: 107. 1989, nom. illeg. (Brown & Braggins 1989)
Riccardia autoica (Steph.) A. Evans, Trans. Connecticut Acad. Arts Sci. 25: 159. 1921. (Evans 1921)

Basionym: Aneura autoica Steph., Bull. Herb. Boissier 7: 691. 1899. (Stephani 1899b)
Riccardia baldwinii (Steph.) H.A. Mill., Ark. Bot., n.s. 5: 527. 1963. (Miller 1963)

Basionym: Aneura baldwinii Steph., Bull. Herb. Boissier 7(10): 743. 1899. (Stephani 1899a)
Riccardia barbiflora (Steph.) Piippo, J. Hattori Bot. Lab. 68: 134. 1990. (Piippo 1990)

Basionym: Aneura barbiflora Steph., Mém. Soc. Sci. Nat. Math. Cherbourg 29: 209. 1894. (Stephani 1895; Piippo 1990)
Riccardia baumannii Hürl., Bauhinia 5: 203. 1976. (Hürlimann 1976)
Riccardia bipinnatifida (Colenso) Hewson, Proc. Linn. Soc. New South Wales 95: 93. 1970. (Hewson 1970)

Basionym: Aneura bipinnatifida Colenso, Trans. & Proc. New Zealand Inst. 16: 358. 1884. (Colenso 1884; Brown & Braggins 1989)
- =Aneura polymorpha Colenso, Trans. & Proc. New Zealand Inst. 22: 457. 1890. (Brown & Braggins 1989)
- =Riccardia bistrata Pearson, Univ. Calif. Publ. Bot. 10: 310. 1923. (Thouvenot et al. 2011)
Riccardia bongeriana Hewson, Proc. Linn. Soc. New South Wales 95: 101. 1970. (Hewson 1970)
Riccardia breviala E.A. Br., J. Hattori Bot. Lab. 66: 46. 1988. (Brown & Braggins 1989)
Riccardia breviramosa (Steph.) A. Evans, Nat. Hist. Juan Fernandez 2: 559. 1930. (Evans 1930)

Basionym: Aneura breviramosa Steph., Kongl. Svenska Vetensk. Acad. Handl., n.s. 46(9): 6. 1911. (Stephani 1911)
Riccardia browniae A. Hagborg & L. Söderstr., Lindbergia 45(01152): 1. 2022. (Hagborg & Söderström 2022)

Replaced synonym: Aneura pusilla Steph., J. & Proc. Roy. Soc. New South Wales 48: 96. 1914. (Stephani & Watts 1914; Hagborg & Söderström 2022)

≡Riccardia pusilla (Steph.) E.A. Br., J. Hattori Bot. Lab. 66: 82. 1989, nom. illeg. (Brown & Braggins 1989)
Riccardia brunnea (Steph.) S. Hatt., Bull. Tokyo Sci. Mus. 11: 164. 1944. (Hattori 1944)

Basionym: Aneura brunnea Steph., Sp. Hepat. (Stephani) 6: 21. 1917. (Stephani 1925)
Riccardia calva (Schiffn.) A. Evans, Trans. Connecticut Acad. Arts Sci. 25: 134. 1921. (Evans 1921)

Basionym: Aneura calva Schiffn., Forschungsr. Gazelle 4(4): 42. 1889. (Schiffner 1889)
Riccardia campanuliflora S.W. Arnell, Bot. Not. 1952: 146. 1952. (Arnell 1952; Perold 2003)
Riccardia canaliculata (Nees) Kuntze, Revis. Gen. Pl. 2: 838. 1891. (Kuntze 1891)

Basionym: Jungermannia canaliculata Nees, Enum. Pl. Crypt. Jav.: 10. 1830. (Nees von Esenbeck 1830)

≡Aneura canaliculata (Nees) Nees, Syn. Hepat.: 500. 1846.
- =Riccardia umbana Hewson, Proc. Linn. Soc. New South Wales 95: 85. 1970. (Hewson 1970; Furuki 1995)
Riccardia cardotii (Steph.) S.C. Srivast. & Udar, Biol. Mem. 1: 131. 1976. (Srivastava & Udar 1976)

Basionym: Aneura cardotii Steph., Bull. Soc. Roy. Bot. Belgique 41(1): 118. 1905. (Renauld & Cardot 1904)
Riccardia cataractarum (Spruce) Schiffn., Denkschr. Österr. Akad. Wiss., Math.-Naturwiss. Kl. 111: 10. 1964. (Schiffner 1964)

Basionym: Aneura cataractarum Spruce, Bull. Soc. Bot. France 36(Suppl. Congrés Bot. 1889): CXCV. 1889[1890]. (Spruce 1889; Gradstein & Reeb 2018b)
- =Aneura uleana Steph., Biblioth. Bot. 87: 176. 1916. (Gradstein & Reeb 2018b)
- =Riccardia paramorum Meenks, J. Hattori Bot. Lab. 62: 176. 1987. (Meenks 1987; Gradstein & Reeb 2018b)
Riccardia chamedryfolia (With.) Grolle, Trans. Brit. Bryol. Soc. 5(4): 772. 1969. (Grolle 1969)

Basionym: Jungermannia chamedryfolia With., Bot. Arr. Veg. Gr. Brit. 2: 699. 1776. (Withering 1776)
- =Jungermannia sinuata Dicks., Fasc. Pl. Crypt. Brit. 2: 16. 1790, nom. illeg. (Dickson 1790) ≡Jungermannia multifida var. sinuata Hook., Brit. Jungermann.: tab. 45. 1813. ≡Riccardia multifida var. sinuata (Hook.) Gray, Nat. Arr. Brit. Pl. 1: 684. 1821. ≡Aneura multifida var. sinuata (Hook.) Dumort., Syll. Jungerm. Europ.: 85. 1831. ≡Gymnomitrion sinuatum (Hook.) Huebener, Hepaticol. Germ.: 39. 1834. ≡Aneura sinuata (Hook.) Dumort., Recueil Observ. Jungerm.: 26. 1835. (Ros et al. 2007) ≡Riccardia latifrons var. sinuata (Hook.) Lindb., Helsingfors Dagblad 1876(323): 2. 1876. ≡Riccardia sinuata (Hook.) Trevis., Mem. Reale Ist. Lombardo Sci., Ser. 3, Cl. Sci. Mat. 4: 431. 1877. (Gradstein & Reeb 2018b) ≡Aneura latifrons var. sinuata (Hook.) Bom. & Broth., Herb. Mus. Fenn. (ed. 2), Musci: 15. 1894. ≡Aneura pinnatifida var. sinuata (Hook.) S. Hatt., Bull. Tokyo Sci. Mus. 11: 168. 1944.
- =Jungermannia macrorhiza Jolycl., Crypt. Compl.: 85. 1799, nom. illeg. (Isoviita 1970)
- =Jungermannia marsilea F. Weber, Hist. Musc. Hepat. Prodr. (Weber): 141. 1815. (Grolle 1969) ≡Jungermannia phyllanthus var. marsilea (F. Weber) Steud., Nomencl. Bot. 2: 227. 1824.
- =Jungermannia multifida var. pinnatifida F. Weber, Hist. Musc. Hepat. Prodr. (Weber): 94. 1815. ≡Jungermannia pinnatifida (F. Weber) Nees, Enum. Pl. Crypt. Jav.: 9. 1830. ≡Aneura multifida var. pinnatifida (F. Weber) Dumort., Syll. Jungerm. Europ.: 86. 1831. ≡Gymnomitrion pinnatifidum (F. Weber) Huebener, Hepaticol. Germ.: 38. 1834. ≡Aneura pinnatifida (F. Weber) Dumort., Recueil Observ. Jungerm.: 26. 1835. (Ros et al. 2007) ≡Sarcomitrium pinnatifidum (F. Weber) Mitt., Fl. Nov.-Zel. 2: 167. 1855. ≡Riccardia pinnatifida (F. Weber) Carruth., J. Bot. 3: 302. 1865. (Gradstein & Reeb 2018b)
- =Aneura pinnatifida f. composita Nees, Naturgesch. Eur. Leberm. 3: 442. 1838. (Schuster 1992) ≡Aneura pinnatifida var. composita (Nees) Debat, Fl. Musc.: 235. 1874.
- =Aneura pinnatifida f. contexta Nees, Naturgesch. Eur. Leberm. 3: 442. 1838. ≡Riccardia sinuata var. contexta (Nees) Schiffn., Sitzungsber. Deutsch. Naturwiss.-Med. Vereins Böhmen "Lotos" Prag 48: 363. 1900. ≡Aneura sinuata f. contexta (Nees) Kavina, Arch. Prir. Vyzk. Cech 16(2): 189. 1915. (Kavina 1915)
- =Aneura pinnatifida f. extensa Nees, Naturgesch. Eur. Leberm. 3: 442. 1838. (Nees von Esenbeck 1838)
- =Aneura pinnatifida f. viridis Nees, Naturgesch. Eur. Leberm. 3: 442. 1838. (Nees von Esenbeck 1838)
- =Aneura pinnatifida f. denticulata Nees, Naturgesch. Eur. Leberm. 3: 443. 1838. (Söderström et al. 2010) ≡Aneura pinnatifida var. denticulata (Nees) Debat, Fl. Musc.: 235. 1874.
- =Aneura multifida f. major Nees, Naturgesch. Eur. Leberm. 3: 450, 452. 1838. ≡Aneura multifida var. major (Nees) Debat, Fl. Musc.: 235. 1874. ≡Riccardia major (Nees) Lindb., Helsingfors Dagblad 1876(323): 2. 1876. (Ros et al. 2007) ≡Riccardia multifida var. major (Nees) C. Massal., Annuario Reale Ist. Bot. Roma 2(2): 133. 1885[1886]. ≡Aneura major (Nees) A. Evans, Zoë 5: 129. 1901. ≡Aneura sinuata var. major (Nees) Macvicar, Stud. Handb. Brit. Hepat. (ed. 2): 55. 1926. (Paton 1999) ≡Riccardia sinuata var. major (Nees) Arnell, Skand. Fl. 2(a): 34. 1928. (Arnell 1928) ≡Riccardia chamedryfolia f. major (Nees) Schljakov, Novosti Sist. Nizsh. Rast. 13: 226. 1976. (Schljakov 1976) ≡Riccardia chamedryfolia var. major (Nees) R.M. Schust. ex Damsh., Ill. Fl. Nord. Liverw. Hornw.: 670. 2002.
- =Aneura crenulata Steph., Bull. Herb. Boissier 5: 85. 1897. (Furuki 1991) ≡Riccardia crenulata (Steph.) Yasuda, Shokub. Kak.: 687. 1911, nom. illeg. (Yasuda 1911) ≡Riccardia stephanii S. Hatt., Bull. Tokyo Sci. Mus. 11: 164. 1944. (Yamada & Iwatsuki 2006)
- =Aneura sinuata f. submersa C.E.O. Jensen ex Müll. Frib., Lebermoose 6(6): 339. 1908. ≡Riccardia sinuata f. submersa (C.E.O. Jensen ex Müll. Frib.) Schiffn., Oesterr. Bot. Z. 59: 85. 1909. ≡Riccardia sinuata var. submersa (C.E.O. Jensen ex Müll. Frib.) Arnell, Skand. Fl. 2(a): 34. 1928. (Arnell 1928) ≡Riccardia chamedryfolia var. submersa (C.E.O. Jensen ex Müll. Frib.) Damsh., Ill. Fl. Nord. Liverw. Hornw.: 670. 2002. (Hodgetts et al. 2020)
- =Riccardia sinuata var. subincurvata Schiffn., Oesterr. Bot. Z. 59: 85. 1909. (Schiffner 1909) ≡Aneura sinuata f. subincurvata (Schiffn.) Fam., Denkschr. Bayer. Bot. Ges. Regensburg 14: 37. 1920.
- =Aneura koyensis Steph., Sp. Hepat. (Stephani) 6: 31. 1917. (Yamada & Iwatsuki 2006) ≡Riccardia koyensis (Steph.) Yasuda, Shokub. Kak.: 687. 1911. (Yasuda 1911; Yamada & Iwatsuki 2006)
- =Riccardia micronesica H.A. Mill. & Bonner, Beih. Nova Hedwigia 11: 69. 1963. (Schuster 1992)
Riccardia changbaishanensis C. Gao, Fl. Hepat. Chin. Boreali-Orient.: 209. 1981. (Gao & Chang 1981)
Riccardia chinensis C. Gao, Fl. Hepat. Chin. Boreali-Orient.: 209. 1981. (Gao & Chang 1981)
Riccardia ciliolata (Spruce) Horik., J. Sci. Hiroshima Univ., Ser. B, Div. 2, Bot. 1: 198. 1933. (Horikawa 1933)

Basionym: Aneura ciliolata Spruce, Trans. & Proc. Bot. Soc. Edinburgh 15: 547. 1885. (Spruce 1884–1885; Gradstein & Reeb 2018b)
Riccardia cochleata (Hook. f. & Taylor) Kuntze, Revis. Gen. Pl. 2: 838. 1891. (Kuntze 1891)

Basionym: Riccia cochleata Hook. f. & Taylor, London J. Bot. 4: 96. 1845. (Hooker & Taylor 1845)

≡Sarcomitrium cochleatum (Hook. f. & Taylor) Mitt., Fl. Tasman. 2: 240. 1859. ≡Aneura cochleata (Hook. f. & Taylor) Steph., Hedwigia 32: 137. 1893. (Brown & Braggins 1989)
- =Aneura erecta Steph., Sp. Hepat. (Stephani) 1: 268. 1899. (Brown & Braggins 1989)
- =Aneura cochleata f. lichenoides Rodway, Tasman. Bryoph. 2: 64. 1916. (Rodway 1916)
- =Aneura lichenoides Steph., Sp. Hepat. (Stephani) 6: 32. 1917, nom. illeg. (Brown & Braggins 1989)
Riccardia colensoi (Steph.) W. Martin, Trans. & Proc. Roy. Soc. New Zealand 78: 499. 1950. (Martin 1950)

Basionym: Aneura colensoi Steph., J. Linn. Soc., Bot. 29: 264. 1892. (Stephani 1892; Brown & Braggins 1989)
- =Aneura tasmanica Steph., Sp. Hepat. (Stephani) 1: 247. 1899. (Brown & Braggins 1989)
Riccardia comata (Steph.) H.A. Mill., Phytologia 47: 323. 1981. (Miller 1981)

Basionym: Aneura comata Steph., Sp. Hepat. (Stephani) 6: 22. 1917. (Stephani 1925)
Riccardia comptonii (Pearson) H.A. Mill., Phytologia 47: 323. 1981. (Miller 1981)

Basionym: Aneura comptonii Pearson, J. Linn. Soc., Bot. 46: 17. 1922. (Pearson et al. 1922)
Riccardia conimitra (Steph.) A. Evans, Trans. Connecticut Acad. Arts Sci. 25: 156. 1921. (Evans 1921)

Basionym: Aneura conimitra Steph., Bull. Herb. Boissier 7(10): 749. 1899. (Stephani 1899a)
- =Riccardia variabilis A. Evans, Nat. Hist. Juan Fernandez 2: 567. 1930. (Evans 1930; Hässel de Menéndez & Rubies 2009)
Riccardia corbierei (Steph.) Reeb & Gradst., Cryptog., Bryol. 41(2): 20. 2020. (Reeb & Gradstein 2020)

Basionym: Aneura corbierei Steph., Sp. Hepat. (Stephani) 6: 23. 1917. (Stephani 1925; Reeb & Gradstein 2020)
- =Aneura nudiflora Steph., Bot. Gaz. 15: 282. 1890, nom. dub. (Reeb & Bardat 2014) ≡Riccardia nudiflora (Steph.) Grolle, Bryophyt. Biblioth. 48: 130. 1995, nom. dub. (Grolle 1995; Reeb & Gradstein 2020)
Riccardia corralensis (Steph.) A. Evans, Trans. Connecticut Acad. Arts Sci. 25: 143. 1921. (Evans 1921)

Basionym: Aneura corralensis Steph., Bull. Herb. Boissier 7(10): 742. 1899. (Stephani 1899a)
Riccardia costata (Steph.) Hürl., Bauhinia 5: 206. 1976. (Hürlimann 1976)

Basionym: Aneura costata Steph., Sp. Hepat. (Stephani) 6: 23. 1917. (Stephani 1925)
Riccardia crassa (Schwägr.) C. Massal., Nuovo Giorn. Bot. Ital. 17(3): 254. 1885. (Massalongo 1885)

Basionym: Jungermannia crassa Schwägr., Hist. Musc. Hepat. Prodr. (Schwägrichen): 31. 1814. (Schwägrichen 1814)

≡Aneura crassa (Schwägr.) Nees, Syn. Hepat.: 500. 1846. (Brown & Braggins 1989) ≡Sarcomitrium crassum (Schwägr.) Mitt., Fl. Nov.-Zel.: 167. 1855.
- =Aneura striolata Steph., J. Linn. Soc., Bot. 29: 265. 1892. (Brown & Braggins 1989)
- =Riccardia scabra Schiffn., Denkschr. Kaiserl. Akad. Wiss., Wien Math.-Naturwiss. Kl. 67: 161. 1898. (Söderström et al. 2010) ≡Aneura scabra (Schiffn.) Steph., Sp. Hepat. (Stephani) 1: 246. 1899. (Brown & Braggins 1989)
- =Riccardia scabra var. tjiburrumensis Schiffn., Denkschr. Kaiserl. Akad. Wiss., Wien Math.-Naturwiss. Kl. 67: 161. 1898. (Brown & Braggins 1989)
- =Aneura stolonifera Steph., Sp. Hepat. (Stephani) 1: 247. 1899. (Váňa & Engel 2013) ≡Riccardia stolonifera (Steph.) E.A. Hodgs., Rec. Domin. Mus. 4: 130. 1962.
- =Aneura rufescens Steph., J. & Proc. Roy. Soc. New South Wales 48: 96. 1914. (Brown & Braggins 1989)
- =Aneura walesiana Steph., J. & Proc. Roy. Soc. New South Wales 48: 97. 1914. (Brown & Braggins 1989)
- =Aneura longiflora f. submersa Rodway, Tasman. Bryoph. 2: 63. 1916. (Brown & Braggins 1989)
- =Aneura coriacea Steph., Sp. Hepat. (Stephani) 6: 23. 1917. (Brown & Braggins 1989)
- =Aneura papulolimbata Steph., Sp. Hepat. (Stephani) 6: 36. 1917. (Brown & Braggins 1989)
- =Aneura spathuliloba Steph., Sp. Hepat. (Stephani) 6: 42. 1917. (Brown & Braggins 1989)
- =Riccardia kanemarui S. Hatt., J. Hattori Bot. Lab. 6: 9. 1951. (Yamada & Iwatsuki 2006)
Riccardia crassicrispa (Steph.) A. Evans, Trans. Connecticut Acad. Arts Sci. 25: 194. 1921. (Evans 1921)

Basionym: Aneura crassicrispa Steph., Kongl. Svenska Vetensk. Acad. Handl., n.s. 46(9): 6. 1911. (Stephani 1911)
Riccardia crassiretis Schiffn., Denkschr. Kaiserl. Akad. Wiss., Wien Math.-Naturwiss. Kl. 67: 173. 1898. (Schiffner 1899a)

≡Aneura crassiretis (Schiffn.) Steph., Sp. Hepat. (Stephani) 1: 230. 1899.
Riccardia crenulata Schiffn., Denkschr. Kaiserl. Akad. Wiss., Wien Math.-Naturwiss. Kl. 67: 173. 1898. (Schiffner 1899a; Furuki 2001)
- =Riccardia crenatilimbia Schiffn., Hedwigia 39: 193. 1900, nom. illeg. (Söderström et al. 2010)
- =Riccardia tenuicostata Schiffn., Arch. Hydrobiol., Suppl. 21(3/4): 390. 1955, nom. illeg. (Reeb & Bardat 2014)
Riccardia crenuliformis R.M. Schust., J. Hattori Bot. Lab. 67: 72. 1989. (Schuster 1989)
Riccardia deguchii Furuki & K.T. Yong, Hikobia 16(3): 285. 2013. (Furuki et al. 2013)
Riccardia densiramea (Steph.) S. Hatt., Bull. Tokyo Sci. Mus. 11: 164. 1944. (Hattori 1944)

Basionym: Aneura densiramea Steph., Sp. Hepat. (Stephani) 6: 24. 1917. (Stephani 1925)
Riccardia devexa Schiffn., Denkschr. Österr. Akad. Wiss., Math.-Naturwiss. Kl. 111: 112. 1964. (Schiffner 1964)
Riccardia diderma Hässel, Revista Mus. Argent. Ci. Nat., Bernardino Rivadavia Inst. Nac. Invest. Ci. Nat., Bot. 4(1): 56. 1972. (Hässel de Menéndez 1972)
Riccardia digitiloba (Spruce) Pagán, Bryologist 42: 6. 1939. (Pagán 1939)

Basionym: Aneura digitiloba Spruce, Bull. Soc. Bot. France 36(Suppl. Congrés Bot. 1889): CCI. 1889[1890]. (Spruce 1889; Gradstein & Reeb 2018b)
- =Aneura metzgeriiformis Steph., Sp. Hepat. (Stephani) 1: 263. 1899. (Gradstein & Reeb 2018b) ≡Riccardia metzgeriiformis (Steph.) R.M. Schust., J. Hattori Bot. Lab. 26: 295. 1963. (Schuster 1963; Gradstein & Reeb 2018b)
- =Aneura calcarea Steph., Sp. Hepat. (Stephani) 1: 266. 1899. (Gradstein & Reeb 2018b) ≡Riccardia calcarea (Steph.) Meenks, J. Hattori Bot. Lab. 62: 170. 1987. (Meenks 1987; Gradstein & Reeb 2018b)
- =Riccardia digitiloba f. lignicola Schiffn., Denkschr. Österr. Akad. Wiss., Math.-Naturwiss. Kl. 111: 17. 1964. (Yano 2008)
- =Riccardia digitiloba f. propagulifera Schiffn., Denkschr. Österr. Akad. Wiss., Math.-Naturwiss. Kl. 111: 17. 1964. (Yano 2008)
- =Riccardia gemmipara Schiffn., Denkschr. Österr. Akad. Wiss., Math.-Naturwiss. Kl. 111: 18. 1964. (Gradstein & Costa 2003)
- =Riccardia gemmipara f. cochleata Schiffn., Denkschr. Österr. Akad. Wiss., Math.-Naturwiss. Kl. 111: 18. 1964. (Yano 1996)
- =Riccardia gemmipara f. alpina Schiffn., Denkschr. Österr. Akad. Wiss., Math.-Naturwiss. Kl. 111: 19. 1964. (Yano 1996)
Riccardia dilatata (Spruce) Schäf.-Verw. & Pócs, Cryptog., Bryol. 31(4): 389. 2010. (Schäfer-Verwimp 2010)

Basionym: Aneura dilatata Spruce, J. Linn. Soc., Bot. 30: 368. 1895. (Spruce 1895)
Riccardia diminuta Schiffn., Denkschr. Kaiserl. Akad. Wiss., Wien Math.-Naturwiss. Kl. 67: 170. 1898. (Schiffner 1899a)

≡Aneura diminuta (Schiffn.) Steph., Sp. Hepat. (Stephani) 1: 266. 1899.
- =Riccardia diminuta f. longispica Schiffn., Denkschr. Kaiserl. Akad. Wiss., Wien Math.-Naturwiss. Kl. 67: 171. 1898. (Söderström et al. 2010)
- =Riccardia diminuta f. propagulifera Schiffn., Denkschr. Kaiserl. Akad. Wiss., Wien Math.-Naturwiss. Kl. 67: 171. 1898. (Söderström et al. 2010)
- =Riccardia diminuta f. subpalmata Schiffn., Denkschr. Kaiserl. Akad. Wiss., Wien Math.-Naturwiss. Kl. 67: 171. 1898. (Söderström et al. 2010)
- =Aneura pulcra Pearson, J. Linn. Soc., Bot. 46(305): 15. 1922. (Thouvenot et al. 2011)
Riccardia diminuta Schiffn. var. diminuta
Riccardia diminuta var. thermarum Schiffn., Denkschr. Kaiserl. Akad. Wiss., Wien Math.-Naturwiss. Kl. 67: 172. 1898. (Schiffner 1899a; Söderström et al. 2010)
Riccardia dimorpha Glenny, Telopea 27: 74. 2024. (Glenny 2024)
Riccardia diversiflora A. Evans, Trans. Connecticut Acad. Arts Sci. 25: 167. 1921. (Evans 1921)
Riccardia diversiflora A. Evans subsp. diversiflora
Riccardia diversiflora subsp. paucigyna R.M. Schust., J. Hattori Bot. Lab. 67: 97. 1989. (Schuster 1989; Grolle 2002)
Riccardia duriuscula Hässel, Revista Mus. Argent. Ci. Nat., Bernardino Rivadavia Inst. Nac. Invest. Ci. Nat., Bot. 4(1): 82. 1972. (Hässel de Menéndez 1972)
Riccardia elata (Steph.) Schiffn., Denkschr. Kaiserl. Akad. Wiss., Wien Math.-Naturwiss. Kl. 67: 169. 1898. (Schiffner 1899a; Furuki & Tan 2013)

Basionym: Aneura elata Steph., Hedwigia 32: 19. 1893. (Stephani 1893)
- =Riccardia elata var. angustior Schiffn., Denkschr. Kaiserl. Akad. Wiss., Wien Math.-Naturwiss. Kl. 67: 169. 1898. (Furuki & Tan 2013)
- =Riccardia elata var. stephanii Schiffn., Denkschr. Kaiserl. Akad. Wiss., Wien Math.-Naturwiss. Kl. 67: 169. 1898. (Furuki & Tan 2013)
- =Riccardia elata f. propagulifera Schiffn., Denkschr. Kaiserl. Akad. Wiss., Wien Math.-Naturwiss. Kl. 67: 170. 1898. (Söderström et al. 2010)
- =Riccardia ridleyi Schiffn., Denkschr. Kaiserl. Akad. Wiss., Wien Math.-Naturwiss. Kl. 67: 172. 1898. (Furuki & Tan 2013) ≡Aneura ridleyi (Schiffn.) Steph., Sp. Hepat. (Stephani) 1: 219. 1899.
- =Aneura dicrana Steph., Sp. Hepat. (Stephani) 1: 224. 1899. (Furuki & Tan 2013)
Riccardia elata (Steph.) Schiffn. var. elata
Riccardia elata var. flaccida Schiffn., Denkschr. Kaiserl. Akad. Wiss., Wien Math.-Naturwiss. Kl. 67: 170. 1898. (Schiffner 1899a; Söderström et al. 2010)
Riccardia elata var. intercedens Schiffn., Denkschr. Kaiserl. Akad. Wiss., Wien Math.-Naturwiss. Kl. 67: 170. 1898. (Schiffner 1899a; Söderström et al. 2010)
Riccardia elegans (Steph.) Hürl., Bauhinia 5: 196. 1976. (Hürlimann 1976)

Basionym: Aneura elegans Steph., Sp. Hepat. (Stephani) 6: 25. 1917. (Stephani 1925)
Riccardia elisabethae Thouvenot & Reeb, Telopea 17: 229. 2014. (Thouvenot & Reeb 2014)
Riccardia emarginata (Steph.) K.G. Hell, Bol. Fac. Filos. Univ. São Paulo, Bot. 25: 100. 1969. (Hell 1969)

Basionym: Aneura emarginata Steph., Hedwigia 32: 20. 1893. (Stephani 1893)
Riccardia eriocaula (Hook.) Besch. & C. Massal., Miss. Sci. Cape Horn, Bot. 5: 244. 1889. (Bescherelle & Massalongo 1889)

Basionym: Jungermannia eriocaula Hook., Musci Exot. 1: pl. 72. 1818. (Hooker 1818)

≡Acrostolia eriocaula (Hook.) Dumort., Recueil Observ. Jungerm.: 26. 1835. (Brown & Braggins 1989) ≡Metzgeria eriocaula (Hook.) Gottsche, Lindenb. & Nees, Syn. Hepat.: 505. 1846. (Brown & Braggins 1989) ≡Sarcomitrium eriocaulum (Hook.) Mitt., Fl. Nov.-Zel. 2: 168. 1855. ≡Pseudoneura eriocaula (Hook.) Schiffn., Forschungsr. Gazelle 4(4): 41. 1889[1890]. (Brown & Braggins 1989) ≡Aneura eriocaula (Hook.) Steph., Hedwigia 32: 137. 1893. (Brown & Braggins 1989)
Riccardia falsifloribunda Hässel, Revista Mus. Argent. Ci. Nat., Bernardino Rivadavia Inst. Nac. Invest. Ci. Nat., Bot. 4(1): 119. 1972. (Hässel de Menéndez 1972)
Riccardia fastigiata (Lehm.) Trevis., Mem. Reale Ist. Lombardo Sci., Ser. 3, Cl. Sci. Mat. 4: 431. 1877. (Trevisan de Saint-Léon 1877)

Basionym: Jungermannia fastigiata Lehm., Linnaea 4: 370. 1829. (Lehmann 1829)

≡Aneura fastigiata (Lehm.) Lehm. & Lindenb., Syn. Hepat.: 500. 1846. (Reeb & Gradstein 2020)
- =Aneura caespitans Steph., Bull. Soc. Roy. Bot. Belgique 30(2): 194. 1891. (Renauld & Cardot 1891; Reeb & Gradstein 2020)
Riccardia filicina (Colenso) E.A. Hodgs., Rec. Domin. Mus. 4: 129. 1962. (Hodgson 1962; Söderström et al. 2016)

Basionym: Aneura filicina Colenso, Trans. & Proc. New Zealand Inst. 16: 358. 1884. (Colenso 1884)
- =Aneura australis Hook. f. & Lév., Choix Pl. Nouv.-Zél.: 9. 1846. (Raoul 1846; Gibb et al. 2018) ≡Riccardia australis (Hook. f. & Lév.) E.A. Br., J. Hattori Bot. Lab. 66: 101. 1989, nom. illeg. (Brown & Braggins 1989)
- =Aneura micropinna Steph., Hedwigia 32: 24. 1893. (Gibb et al. 2018) ≡Riccardia micropinna (Steph.) H.A. Mill., Phytologia 47: 324. 1981. (Miller 1981)
Riccardia flaccida (Steph.) S. Hatt., Bull. Tokyo Sci. Mus. 11: 164. 1944. (Hattori 1944)

Basionym: Aneura flaccida Steph., Sp. Hepat. (Stephani) 6: 26. 1917. (Stephani 1925)
Riccardia flaccidissima Schiffn., Denkschr. Kaiserl. Akad. Wiss., Wien Math.-Naturwiss. Kl. 67: 167. 1898. (Schiffner 1899a)

≡Aneura flaccidissima (Schiffn.) Steph., Sp. Hepat. (Stephani) 1: 243. 1899.
Riccardia flagellaris (A. Gepp) H.A. Mill., Phytologia 47: 323. 1981. (Miller 1981)

Basionym: Aneura flagellaris A. Gepp, J. Linn. Soc., Bot. 39: 194. 1909. (Gepp 1909)
Riccardia flagellifrons C. Gao, Fl. Hepat. Chin. Boreali-Orient.: 209. 1981. (Gao & Chang 1981)
Riccardia flavovirens Furuki, J. Hattori Bot. Lab. 70: 333. 1991. (Furuki 1991)
Riccardia fleischeri (Steph.) H.A. Mill., Ark. Bot., n.s. 5: 527. 1963. (Miller 1963)

Basionym: Aneura fleischeri Steph., Sp. Hepat. (Stephani) 6: 26. 1917. (Stephani 1925)
Riccardia floribunda (Steph.) A. Evans, Trans. Connecticut Acad. Arts Sci. 25: 182. 1921. (Evans 1921)

Basionym: Aneura floribunda Steph., Bull. Herb. Boissier 7: 749. 1899. (Stephani 1899a)
- =Aneura profunda Steph., Kongl. Svenska Vetensk. Acad. Handl., n.s. 46(9): 8. 1911. (Hässel de Menéndez & Rubies 2009)
- =Riccardia floribunda var. longispica Herzog, Beih. Bot. Centralbl., Abt. 2, 60B(1–2): 2. 1939. (Hässel de Menéndez & Rubies 2009)
- =Riccardia innovata S.W. Arnell, Arch. Soc. Zool. Bot. Fenn. "Vanamo" 9: 50. 1954. (Arnell 1954; Hässel de Menéndez & Rubies 2009)
Riccardia fluvigena Hässel, Revista Mus. Argent. Ci. Nat., Bernardino Rivadavia Inst. Nac. Invest. Ci. Nat., Bot. 4(1): 73. 1972. (Hässel de Menéndez 1972)
Riccardia formosensis (Steph.) Horik., J. Sci. Hiroshima Univ., Ser. B, Div. 2, Bot. 2: 125. 1934. (Horikawa 1934)

Basionym: Aneura formosensis Steph., Sp. Hepat. (Stephani) 6: 27. 1917. (Stephani 1925; Piippo 1990)
Riccardia fruticosa (Steph.) Furuki, Nat. Hist. Res. 5: 1. 1998. (Furuki 1998)

Basionym: Aneura fruticosa Steph., Sp. Hepat. (Stephani) 6: 27. 1917. (Stephani 1925)
Riccardia fucoidea (Sw.) C. Massal., Nuovo Giorn. Bot. Ital. 17: 256. 1885. (Massalongo 1885)

Basionym: Jungermannia fucoidea Sw., Prodr.: 145. 1788. (Swartz 1788)

≡Acrostolia fucoidea (Sw.) Dumort., Recueil Observ. Jungerm.: 26. 1835. (Söderström et al. 2011a) ≡Metzgeria fucoidea (Sw.) Mont. & Nees, Voy. Amér. Mér. 7(2): 60. 1839. (Montagne 1839; Costa 2008) ≡Pseudoneura fucoidea (Sw.) Gottsche, Ann. Sci. Nat., Bot., sér. 5, 1: 184. 1864. ≡Aneura fucoidea (Sw.) Steph., Sp. Hepat. (Stephani) 1: 221. 1899. (Gradstein & Reeb 2018b)
- =Pseudoneura bogotensis Gottsche, Ann. Sci. Nat., Bot., sér. 5, 1: 184. 1864. ≡Acrostolia bogotensis (Gottsche) Trevis., Mem. Reale Ist. Lombardo Sci., Ser. 3, Cl. Sci. Mat. 4: 431. 1877. ≡Aneura bogotensis (Gottsche) Steph., Sp. Hepat. (Stephani) 1: 213. 1899. (Gradstein & Reeb 2018b) ≡Riccardia bogotensis (Gottsche) Pagán, Bryologist 42: 6. 1939. (Gradstein & Reeb 2018b)
- =Pseudoneura papillata Gottsche, Ann. Sci. Nat., Bot., sér. 5, 1: 185. 1864. ≡Acrostolia papillata (Gottsche) Trevis., Mem. Reale Ist. Lombardo Sci., Ser. 3, Cl. Sci. Mat. 4: 431. 1877. ≡Aneura papillata (Gottsche) Steph., Sp. Hepat. (Stephani) 1: 222. 1899. (Gradstein & Reeb 2018b) ≡Riccardia papillata (Gottsche) Hässel ex Gradst. & Hekking, J. Hattori Bot. Lab. 45: 130. 1979. (Gradstein & Hekking 1979; Gradstein & Reeb 2018b)
- =Metzgeria fucoidea var. decrescens Gottsche & Rabenh., Hepat. Eur. 56–57: no. 559. 1873. (Gottsche & Rabenhorst 1873)
- =Metzgeria fucoidea var. tuberculata Gottsche & Rabenh., Hepat. Eur. 56–57: no. 559. 1873. (Gottsche & Rabenhorst 1873)
- =Metzgeria fucoidea var. subalata Gottsche & Rabenh., Hepat. Eur. 56–57: no. 560. 1873. (Gottsche & Rabenhorst 1873)
- =Pseudoneura virgata Gottsche & Rabenh., Hepat. Eur.: No. 560. 1873. ≡Acrostolia virgata (Gottsche & Rabenh.) Trevis., Mem. Reale Ist. Lombardo Sci., Ser. 3, Cl. Sci. Mat. 4: 431. 1877. ≡Aneura virgata (Gottsche & Rabenh.) Gottsche, Hedwigia 27: 277. 1888. (Stephani 1888; Reeb et al. 2022) ≡Riccardia virgata (Gottsche & Rabenh.) Pagán, Bryologist 42: 7. 1939. (Reeb et al. 2022)
- =Aneura andina Spruce, Trans. & Proc. Bot. Soc. Edinburgh 15: 548. 1885. (Spruce 1884–1885; Gradstein & Reeb 2018b) ≡Riccardia andina (Spruce) Herzog, Svensk Bot. Tidskr. 46: 65. 1952. (Gradstein & Reeb 2018b)
- =Aneura plumiformis Spruce, Trans. & Proc. Bot. Soc. Edinburgh 15: 548. 1885. (Spruce 1884–1885) ≡Riccardia plumiformis (Spruce) Hässel ex Meenks, Beih. Nova Hedwigia 88: 101. 1987. (Schultze-Motel & Menzel 1987; Gradstein & Reeb 2018b)
- =Aneura lepidomitra Spruce, Trans. & Proc. Bot. Soc. Edinburgh 15: 549. 1885. (Spruce 1884–1885; Gradstein & Reeb 2018b) ≡Riccardia lepidomitra (Spruce) Gradst., J. Hattori Bot. Lab. 45: 130. 1979. (Gradstein & Hekking 1979; Gradstein & Reeb 2018b)
- =Aneura grossidens Steph., Hedwigia 32: 23. 1893. ≡Riccardia grossidens (Steph.) Pagán, Bryologist 45: 80. 1942. (Reeb et al. 2022)
- =Aneura diablotina Spruce, J. Linn. Soc., Bot. 30: 366. 1895. ≡Riccardia diablotina (Spruce) Pagán, Bryologist 45(4): 80. 1942. (Reeb et al. 2022)
- =Aneura distans Spruce, J. Linn. Soc., Bot. 30: 367. 1895. ≡Riccardia distans (Spruce) Pagán, Bryologist 45: 80. 1942. (Reeb et al. 2022)
- =Aneura crassicaulis Steph., Biblioth. Bot. 87: 174. 1916. (Gradstein & Reeb 2018b) ≡Riccardia crassicaulis (Steph.) Meenks & C. De Jong, Cryptog. Bryol. Lichénol. 6: 8. 1985. (Meenks & De Jong 1985; Gradstein & Reeb 2018b)
- =Aneura weberbaueri Steph., Sp. Hepat. (Stephani) 6: 46. 1917. (Meenks 1987)
- =Aneura fucoidea var. dentilobula Herzog, Arch. Bot. São Paulo 1(2): 34. 1925. (Yano 2008)
- =Riccardia fucoidea f. subaquatica Schiffn., Denkschr. Österr. Akad. Wiss., Math.-Naturwiss. Kl. 111: 12. 1964. (Yano 2008)
Riccardia fuegiensis C. Massal., Nuovo Giorn. Bot. Ital. 17: 255. 1885. (Massalongo 1885)

≡Pseudoneura fuegiensis (C. Massal.) Schiffn., Forschungsr. Gazelle 4(4): 40. 1889[1890]. ≡Aneura fuegiensis (C. Massal.) Steph., Sp. Hepat. (Stephani) 1: 210. 1899.
- =Aneura polyptera Mitt. ex Thurn, Timehri 5: 222. 1886. (Thurn 1886; Hässel de Menéndez & Rubies 2009)
Riccardia furtiva E.A. Br. & Braggins, J. Hattori Bot. Lab. 66: 35. 1989. (Brown & Braggins 1989)
Riccardia fuscobrunnea (Steph.) A. Evans, Trans. Connecticut Acad. Arts Sci. 25: 152. 1921. (Evans 1921)

Basionym: Aneura fuscobrunnea Steph., Kongl. Svenska Vetensk. Acad. Handl., n.s. 46(9): 7. 1911. (Stephani 1911)
Riccardia gaspardii Reeb & Gradst., Cryptog., Bryol. 41(2): 22. 2020. (Reeb & Gradstein 2020)
Riccardia geniana Hewson, Proc. Linn. Soc. New South Wales 95: 76. 1970. (Hewson 1970)
Riccardia georgiensis (Steph.) Hässel, Revista Mus. Argent. Ci. Nat., Bernardino Rivadavia Inst. Nac. Invest. Ci. Nat., Bot. 4: 122. 1972. (Hässel de Menéndez 1972)

Basionym: Aneura georgiensis Steph., Wiss. Ergebn. Schwed. Südpolar-Exped. 1901–1903, 4(1): 2. 1905. (Stephani 1905)
- =Aneura subantarctica Kaal., Nytt Mag. Bot. 49: 87. 1911. (Grolle 2002)
- =Riccardia roivainenii S.W. Arnell, Arch. Soc. Zool. Bot. Fenn. "Vanamo" 9: 52. 1954. (Arnell 1954; Hässel de Menéndez & Rubies 2009)
Riccardia georgiensis (Steph.) Hässel subsp. georgiensis
Riccardia georgiensis subsp. sympodea R.M. Schust., J. Hattori Bot. Lab. 67: 83. 1989. (Schuster 1989; Hässel de Menéndez & Rubies 2009)
Riccardia glauca Furuki, J. Hattori Bot. Lab. 70: 352. 1991. (Furuki 1991)
Riccardia glaziovii (Spruce) Meenks, J. Hattori Bot. Lab. 62: 173. 1987. (Meenks 1987)

Basionym: Aneura glaziovii Spruce, Bull. Soc. Bot. France 36(Suppl. Congrés Bot. 1889): CCI. 1889[1890]. (Spruce 1889)
- =Aneura tripinnata Steph., Bull. Soc. Roy. Bot. Belgique 31: 175. 1892. (Schiffner 1964)
- =Aneura alata Steph., Sp. Hepat. (Stephani) 1: 240. 1899. ≡Riccardia alata (Steph.) K.G. Hell, Bol. Fac. Filos. Univ. São Paulo, Bot. 25: 95. 1969. (Hell 1969; Gradstein & Costa 2003)
- =Riccardia insignis Schiffn., Denkschr. Österr. Akad. Wiss., Math.-Naturwiss. Kl. 111: 15. 1964. (Gradstein & Costa 2003)
Riccardia gogolensis (Steph.) Hewson, Proc. Linn. Soc. New South Wales 95: 102. 1970. (Hewson 1970)

Basionym: Aneura gogolensis Steph., Bull. Herb. Boissier 7(9): 689. 1899. (Stephani 1899b)
Riccardia gracilis (Steph.) R.M. Schust., J. Hattori Bot. Lab. 26: 295. 1963. (Schuster 1963)

Basionym: Aneura gracilis Steph., Bull. Herb. Boissier 7(10): 752. 1899. (Stephani 1899a)
Riccardia gradsteinii Pócs, Acta Bot. Hung. 61(3–4): 390. 2019. (Pócs 2019)
Riccardia graeffei (Steph.) Hewson, Proc. Linn. Soc. New South Wales 95(1): 118. 1970. (Hewson 1970)

Basionym: Aneura graeffei Steph., Hedwigia 32: 21. 1893. (Stephani 1893)
- =Aneura fuscescens Steph., Hedwigia 32: 21. 1893. (Thouvenot et al. 2011) ≡Riccardia fuscescens (Steph.) A.L. Andrews, Atoll Res. Bull. 5: 56. 1951.
- =Riccardia androgyna Schiffn., Denkschr. Kaiserl. Akad. Wiss., Wien Math.-Naturwiss. Kl. 67: 164. 1898. (Söderström et al. 2010) ≡Aneura androgyna (Schiffn.) Steph., Sp. Hepat. (Stephani) 1: 216. 1899. (Furuki 1991)
- =Riccardia elongata Schiffn., Denkschr. Kaiserl. Akad. Wiss., Wien Math.-Naturwiss. Kl. 67: 164. 1898. (Söderström et al. 2010)
- =Riccardia platyclada Schiffn., Denkschr. Kaiserl. Akad. Wiss., Wien Math.-Naturwiss. Kl. 67: 167. 1898. (Wang et al. 2011) ≡Aneura platyclada (Schiffn.) Steph., Sp. Hepat. (Stephani) 1: 249. 1899. (Furuki 1991)
- =Riccardia platyclada f. crenulata Schiffn., Denkschr. Kaiserl. Akad. Wiss., Wien Math.-Naturwiss. Kl. 67: 168. 1898. (Söderström et al. 2010)
- =Riccardia platyclada var. grandiretis Schiffn., Denkschr. Kaiserl. Akad. Wiss., Wien Math.-Naturwiss. Kl. 67: 168. 1898. (Schiffner 1899a)
- =Riccardia platyclada var. leiomitra Schiffn., Denkschr. Kaiserl. Akad. Wiss., Wien Math.-Naturwiss. Kl. 67: 168. 1898. (Schiffner 1899a)
- =Riccardia platyclada f. propagulifera Schiffn., Denkschr. Kaiserl. Akad. Wiss., Wien Math.-Naturwiss. Kl. 67: 168. 1898. (Furuki 1991)
- =Riccardia platyclada var. repens Schiffn., Denkschr. Kaiserl. Akad. Wiss., Wien Math.-Naturwiss. Kl. 67: 168. 1898. (Schiffner 1899a)
- =Riccardia latifrondoides f. major Schiffn., Denkschr. Kaiserl. Akad. Wiss., Wien Math.-Naturwiss. Kl. 67: 169. 1898. (Furuki & Tan 2013)
- =Aneura leratii Steph., Rev. Bryol. 35: 34. 1908. (Thouvenot et al. 2011) ≡Riccardia leratii (Steph.) Hürl., Bauhinia 5: 206. 1976. (Hürlimann 1976)
- =Aneura flavescens Spruce ex Steph., Sp. Hepat. (Stephani) 6: 26. 1917. (Furuki & Tan 2013)
- =Aneura nadeaudiana Steph., Sp. Hepat. (Stephani) 6: 34. 1917. (Furuki 1991) ≡Riccardia nadeaudiana (Steph.) Hürl., Bauhinia 5: 201. 1976. (Hürlimann 1976; Furuki 1991)
- =Aneura wattsiana Steph., Sp. Hepat. (Stephani) 6: 46. 1917. (Furuki 1991) ≡Riccardia wattsiana (Steph.) Hewson, Proc. Linn. Soc. New South Wales 95: 91. 1970. (Hewson 1970; Furuki 1991)
- =Aneura tutuilana Pearson, Publ. Carnegie Inst. Wash. 20(341): 132. 1924. (Brotherus & Pearson 1924; Furuki 1991) ≡Riccardia tutuilana (Pearson) H.A. Mill., Phytologia 47: 324. 1981. (Miller 1981)
- =Riccardia atollica H.A. Mill., H. Whittier & Bonner, Beih. Nova Hedwigia 11: 68. 1963. (Furuki 1991)
- =Riccardia sorolensis H.A. Mill. & Bonner, Beih. Nova Hedwigia 11: 71. 1963. (Furuki 1991)
Riccardia grandiflora (Steph.) H.A. Mill., Ark. Bot., n.s. 5: 528. 1963. (Miller 1963)

Basionym: Aneura grandiflora Steph., Sp. Hepat. (Stephani) 6: 29. 1917. (Stephani 1925)
Riccardia granulata (Steph.) A. Evans, Trans. Connecticut Acad. Arts Sci. 25: 192. 1921. (Evans 1921)

Basionym: Aneura granulata Steph., Hedwigia 32: 21. 1893. (Stephani 1893)
Riccardia grollei Furuki, Haussknechtia Beih. 9: 139. 1999. (Furuki 1999)
Riccardia grossitexta (Steph.) Furuki, J. Hattori Bot. Lab. 70: 382. 1991. (Furuki 1991)

Basionym: Aneura grossitexta Steph., Sp. Hepat. (Stephani) 6: 29. 1917. (Stephani 1925)
Riccardia gunniana (Steph.) H.A. Mill., Phytologia 47: 323. 1981. (Miller 1981)

Basionym: Aneura gunniana Steph., J. & Proc. Roy. Soc. New South Wales 48: 96. 1914. (Stephani & Watts 1914)
Riccardia hamatiflora (Steph.) H.A. Mill., Ark. Bot., n.s. 5: 526. 1963. (Miller 1963)

Basionym: Aneura hamatiflora Steph., Bull. Herb. Boissier 5: 844. 1897. (Stephani 1897)
Riccardia hans-meyeri (Steph.) Meenks & C. De Jong, Cryptog. Bryol. Lichénol. 6: 12. 1985. (Meenks & De Jong 1985)

Basionym: Aneura hans-meyeri Steph., Sp. Hepat. (Stephani) 6: 29. 1917. (Stephani 1925; Gradstein & Reeb 2018b)
- =Aneura columbica Steph., Sp. Hepat. (Stephani) 6: 22. 1917. ≡Riccardia columbica (Steph.) Hässel ex Gradst. & Hekking, J. Hattori Bot. Lab. 45: 130. 1979. (Gradstein & Hekking 1979; Gradstein & Reeb 2018b)
- =Riccardia hans-meyeri var. dentata Meenks, J. Hattori Bot. Lab. 62: 173. 1987. (Meenks 1987; Gradstein & Reeb 2018b)
Riccardia hattorii Furuki, J. Hattori Bot. Lab. 75: 257. 1994. (Furuki 1994)
Riccardia hawaica (Steph.) H.A. Mill., Ark. Bot., n.s. 5: 528. 1963. (Miller 1963)

Basionym: Aneura hawaica Steph., Sp. Hepat. (Stephani) 6: 30. 1917. (Stephani 1925)
Riccardia hebridensis (Steph.) H.A. Mill., Phytologia 47: 323. 1981. (Miller 1981)

Basionym: Aneura hebridensis Steph., J. & Proc. Roy. Soc. New South Wales 48: 96. 1914. (Stephani & Watts 1914)
Riccardia heteroclada Schiffn., Denkschr. Kaiserl. Akad. Wiss., Wien Math.-Naturwiss. Kl. 67: 175. 1898. (Schiffner 1899a)

≡Aneura heteroclada (Schiffn.) Steph., Sp. Hepat. (Stephani) 1: 239. 1899.
- =Riccardia serrulata Schiffn., Denkschr. Kaiserl. Akad. Wiss., Wien Math.-Naturwiss. Kl. 67: 174. 1898. (Söderström et al. 2011b)
- =Aneura merapiensis Steph., Sp. Hepat. (Stephani) 6: 33. 1917. (Furuki 1998)
Riccardia hirtiflora (Steph.) Schiffn., Denkschr. Österr. Akad. Wiss., Math.-Naturwiss. Kl. 111: 19. 1964. (Schiffner 1964)

Basionym: Aneura hirtiflora Steph., Arch. Mus. Nac. Rio de Janeiro 13: 116. 1903. (Dusén 1903)
Riccardia humilis (Gottsche) O. Yano, J. Hattori Bot. Lab. 56: 530. 1984. (Yano 1984)

Basionym: Pseudoneura humilis Gottsche, Mexik. Leverm.: 260. 1863. (Gottsche 1863)

≡Acrostolia humilis (Gottsche) Trevis., Mem. Reale Ist. Lombardo Sci., Ser. 3, Cl. Sci. Mat. 4: 431. 1877. ≡Aneura humilis (Gottsche) Steph., Sp. Hepat. (Stephani) 1: 226. 1899.
Riccardia hyalina (Steph.) H.A. Mill., Phytologia 47: 324. 1981. (Miller 1981)

Basionym: Aneura hyalina Steph., Sp. Hepat. (Stephani) 6: 31. 1917. (Stephani 1925)
Riccardia hyalitricha Hässel, Revista Mus. Argent. Ci. Nat., Bernardino Rivadavia Inst. Nac. Invest. Ci. Nat., Bot. 4(1): 225. 1972. (Hässel de Menéndez 1972)
Riccardia hydra Hürl., Bauhinia 5: 210. 1976. (Hürlimann 1976)
Riccardia hymenophylloides Schiffn., Denkschr. Kaiserl. Akad. Wiss., Wien Math.-Naturwiss. Kl. 67: 175. 1898. (Schiffner 1899a)

≡Aneura hymenophylloides (Schiffn.) Steph., Sp. Hepat. (Stephani) 1: 224. 1899.
- =Riccardia decipiens Schiffn., Denkschr. Kaiserl. Akad. Wiss., Wien Math.-Naturwiss. Kl. 67: 176. 1898. (Söderström et al. 2010)
- =Riccardia demkarmana Hewson, Proc. Linn. Soc. New South Wales 95: 111. 1970. (Hewson 1970)
Riccardia hymenophylloides var. flaccida Schiffn., Denkschr. Kaiserl. Akad. Wiss., Wien Math.-Naturwiss. Kl. 67: 176. 1898. (Schiffner 1899a; Söderström et al. 2010)
Riccardia hymenophylloides Schiffn. var. hymenophylloides
Riccardia hymenophytoides (Spruce) Meenks, Beih. Nova Hedwigia 88: 101. 1987. (Schultze-Motel & Menzel 1987; Gradstein & Reeb 2018b)

Basionym: Aneura hymenophytoides Spruce, Trans. & Proc. Bot. Soc. Edinburgh 15: 549. 1885. (Spruce 1884–1885; Gradstein & Reeb 2018b)
- =Aneura pectinata Spruce, Trans. & Proc. Bot. Soc. Edinburgh 15: 546. 1885, nom. illeg. (Spruce 1884–1885; Gradstein & Reeb 2018b) ≡Aneura sprucei Steph., Bull. Herb. Boissier 5: 844. 1897. (Gradstein & Reeb 2018b) ≡Riccardia sprucei (Steph.) Meenks & C. De Jong, Cryptog. Bryol. Lichénol. 6: 22. 1985. (Meenks & De Jong 1985; Gradstein & Reeb 2018b)
Riccardia hypipamensis Hewson, Proc. Linn. Soc. New South Wales 95: 97. 1970. (Hewson 1970)
Riccardia ibana Hewson, Proc. Linn. Soc. New South Wales 95: 78. 1970. (Hewson 1970)
Riccardia inconspicua (Steph.) Reeb & Bardat, Cryptog., Bryol. 35(1): 61. 2014. (Reeb & Bardat 2014)

Basionym: Aneura inconspicua Steph., Hedwigia 32: 23. 1893. (Stephani 1893; Reeb & Gradstein 2020)
- =Riccardia tenuicostata Schiffn., Denkschr. Kaiserl. Akad. Wiss., Wien Math.-Naturwiss. Kl. 67: 166. 1898. (Reeb & Gradstein 2020) ≡Aneura tenuicostata (Schiffn.) Steph., Sp. Hepat. (Stephani) 1: 245. 1899. (Reeb & Gradstein 2020)
- =Aneura exigua Steph., Sp. Hepat. (Stephani) 6: 25. 1917. (Reeb & Gradstein 2020)
- =Riccardia babindae Hewson, Proc. Linn. Soc. New South Wales 95: 85. 1970. (Hewson 1970; Reeb & Bardat 2014)
Riccardia incurvata Lindb., Helsingfors Dagblad 1878(315): 2. 1878. (Lindberg 1878)

≡Aneura incurvata (Lindb.) Steph., Hedwigia 32(3): 137. 1893. (Paton 1999) ≡Aneura sinuata var. incurvata (Lindb.) Kavina, Arch. Prir. Vyzk. Cech 16(2): 189. 1915.
Riccardia innovans (Steph.) Pagán, Bryologist 45: 80. 1942. (Pagán 1942)

Basionym: Aneura innovans Steph., Symb. Antill. 2: 470. 1901. (Stephani 1901)
Riccardia insularis Schiffn., Deutsche Südpolar-Exped. 1901–1903, 8: 66. 1906. (Schiffner 1906)
- =Aneura insularis Schiffn., Deutsche Südpolar-Exped. 1901–1903, 8: 66. 1906. (Váňa et al. 2014)
Riccardia intercellula E.A. Br., J. Hattori Bot. Lab. 66: 58. 1989. (Brown & Braggins 1989)
Riccardia intricata (Steph.) Grolle, J. Hattori Bot. Lab. 36: 76. 1972[1973]. (Grolle & Schultze-Motel 1972)

Basionym: Aneura intricata Steph., Bot. Jahrb. Syst. 23: 301. 1896. (Reinecke 1896)
Riccardia jackii Schiffn., Denkschr. Kaiserl. Akad. Wiss., Wien Math.-Naturwiss. Kl. 67: 165. 1898. (Schiffner 1899a)

≡Aneura jackii (Schiffn.) Steph., Sp. Hepat. (Stephani) 1: 217. 1899.
- =Riccardia jackii var. crassior Schiffn., Hepat. Fl. Buitenzorg 1: 46. 1900. ≡Riccardia jackii f. crassior (Schiffn.) Schiffn., Hedwigia 39(4): 193. 1900. (Söderström et al. 2010)
Riccardia jackii var. densa Schiffn., Denkschr. Kaiserl. Akad. Wiss., Wien Math.-Naturwiss. Kl. 67: 165. 1898. (Schiffner 1899a; Söderström et al. 2010)
Riccardia jackii Schiffn. var. jackii
Riccardia jugata R.M. Schust., J. Hattori Bot. Lab. 62: 305. 1987. (Schuster 1987)
Riccardia karstenii (Steph.) Schiffn., Denkschr. Kaiserl. Akad. Wiss., Wien Math.-Naturwiss. Kl. 67: 177. 1898. (Schiffner 1899a)

Basionym: Aneura karstenii Steph., Hedwigia 32: 23. 1893. (Stephani 1893)
Riccardia kodamae Mizut. & S. Hatt., J. Hattori Bot. Lab. 18: 57. 1957. (Mizutani & Hattori 1957)
†Riccardia koonwarriensis Drinnan & T.C. Chambers, Mem. Assoc. Australas. Palaeontol. 3: 14. 1986. (Drinnan & Chambers 1986)
Riccardia lachungensis D. Singh & D.K. Singh, Taiwania 62(1): 36. 2017. (Singh & Singh 2017)
Riccardia laticostata (Spruce) Schiffn., Denkschr. Österr. Akad. Wiss., Math.-Naturwiss. Kl. 111: 12. 1964. (Schiffner 1964)

Basionym: Aneura laticostata Spruce, J. Linn. Soc., Bot. 30: 367. 1895. (Spruce 1895)
Riccardia latifrondoides Schiffn., Denkschr. Kaiserl. Akad. Wiss., Wien Math.-Naturwiss. Kl. 67: 168. 1898. (Schiffner 1899a; Furuki & Tan 2013)

≡Aneura latifrondoides (Schiffn.) Steph., Sp. Hepat. (Stephani) 1: 260. 1899.
Riccardia latifrons (Lindb.) Lindb., Hepat. Hibern.: 513. 1875. (Lindberg 1875)

Basionym: Aneura latifrons Lindb., Morgonbladet (Helsinki) 1873(57): 2. 1873. (Lindberg 1873; Damsholt 2002)
- =Aneura palmata f. major Nees, Naturgesch. Eur. Leberm. 3: 459. 1838. (Schuster 1992) ≡Aneura palmata var. major (Nees) Debat, Fl. Musc.: 235. 1874.
- =Aneura latifrons var. palmatifida Warnst., Krypt.-Fl. Brandenburg, Leber- & Torfm.: 114. 1903. ≡Aneura latifrons f. palmatifida (Warnst.) Kavina, Arch. Prir. Vyzk. Cech 16(2): 197. 1915. (Kavina 1915)
- =Aneura latifrons f. lutescens Kavina, Arch. Prir. Vyzk. Cech 16(2): 197. 1915. (Kavina 1915)
- =Aneura latifrons f. robusta Kavina, Arch. Prir. Vyzk. Cech 16(2): 197. 1915. (Kavina 1915)
- =Riccardia japonica S. Hatt. ex Mizut. & S. Hatt., J. Hattori Bot. Lab. 18: 42. 1957. (Yamada & Iwatsuki 2006)
Riccardia latifrons subsp. arctica R.M. Schust. & Damsh., J. Hattori Bot. Lab. 62: 303. 1987. (Schuster 1987; Hodgetts et al. 2020)
- =Riccardia latifrons var. uliginosa C.E.O. Jensen, Danmarks Mosser 1: 64. 1915. (Damsholt 2002)
Riccardia latifrons (Lindb.) Lindb. subsp. latifrons
Riccardia latifrons (Lindb.) Lindb. var. latifrons
Riccardia latifrons var. miyakeana (Schiffn.) Furuki, J. Hattori Bot. Lab. 70: 375. 1991. (Furuki 1991; Yamada & Iwatsuki 2006)

Basionym: Riccardia miyakeana Schiffn., Oesterr. Bot. Z. 49: 388. 1899. (Schiffner 1899c)
- =Aneura onigajona Steph., Sp. Hepat. (Stephani) 6: 36. 1917. (Yamada & Iwatsuki 2006) ≡Riccardia onigajona (Steph.) S. Hatt., Bull. Tokyo Sci. Mus. 11: 164. 1944.
Riccardia latifrons subsp. parasitans (Steph.) Gradst. & Reeb, Cryptog., Bryol. 39(4): 530. 2018. (Gradstein & Reeb 2018b)

Basionym: Aneura parasitans Steph., Biblioth. Bot. 87: 175. 1916. (Herzog 1916; Gradstein & Reeb 2018b)

≡Riccardia parasitans (Steph.) Meenks & C. De Jong, Cryptog. Bryol. Lichénol. 6: 17. 1985. (Meenks & De Jong 1985; Gradstein & Reeb 2018b)
- =Aneura pulvinata Steph., Biblioth. Bot. 87: 175. 1916. (Gradstein & Reeb 2018b)
Riccardia leptophylla (Spruce) Herzog, Svensk Bot. Tidskr. 46: 65. 1952. (Herzog 1952; Gradstein & Reeb 2018b)

Basionym: Aneura leptophylla Spruce, Trans. & Proc. Bot. Soc. Edinburgh 15: 544. 1885. (Spruce 1884–1885; Gradstein & Reeb 2018b)
- =Aneura tenuicula Spruce, Trans. & Proc. Bot. Soc. Edinburgh 15: 545. 1885. (Spruce 1884–1885) ≡Riccardia tenuicula (Spruce) Schiffn. ex Meenks, Beih. Nova Hedwigia 88: 101. 1987. (Schultze-Motel & Menzel 1987; Gradstein & Reeb 2018b)
- =Aneura allionii Steph., Sp. Hepat. (Stephani) 6: 20. 1917. (Gradstein & Reeb 2018b)
Riccardia leptostachya A. Evans, Nat. Hist. Juan Fernandez 2: 570. 1930. (Evans 1930)
Riccardia leptothallus R.M. Schust., J. Hattori Bot. Lab. 67: 87. 1989. (Schuster 1989)
Riccardia levieri Schiffn., Oesterr. Bot. Z. 49: 130. 1899. (Schiffner 1899b)

≡Aneura levieri (Schiffn.) Steph., Sp. Hepat. (Stephani) 1: 261. 1899.
Riccardia lichenoides (Steph.) H.A. Mill., Phytologia 47: 324. 1981. (Miller 1981)

Basionym: Aneura lichenoides Steph., Bot. Jahrb. Syst. 23: 301. 1896. (Reinecke 1896)
Riccardia ligulata (Steph.) Pócs & Schäf.-Verw., Cryptog., Bryol. 31(4): 390. 2010. (Schäfer-Verwimp 2010)

Basionym: Aneura ligulata Steph., Sp. Hepat. (Stephani) 6: 32. 1917. (Stephani 1925)
Riccardia lillieana (Steph.) H.A. Mill., Ark. Bot., n.s. 5: 527. 1963. (Miller 1963)

Basionym: Aneura lillieana Steph., Sp. Hepat. (Stephani) 6: 33. 1917. (Stephani 1925)
Riccardia lobulata (Colenso) E.A. Hodgs., Trans. Roy. Soc. New Zealand, Bot. 3: 92. 1965. (Hodgson 1965)

Basionym: Zoopsis lobulata Colenso, Trans. & Proc. New Zealand Inst. 18: 250. 1886. (Colenso 1886)
- =Riccardia minima Carrington & Pearson, Proc. Linn. Soc. New South Wales, ser. 2, 2: 1055. 1887. (Brown & Braggins 1989) ≡Aneura minima (Carrington & Pearson) Steph., Sp. Hepat. (Stephani) 1: 229. 1899. (Brown & Braggins 1989)
- =Aneura perpusilla Colenso, Trans. & Proc. New Zealand Inst. 22: 456. 1890. (Brown & Braggins 1989) ≡Riccardia perpusilla (Colenso) E.A. Hodgs., Trans. Roy. Soc. New Zealand, Bot. 3(4): 93. 1965. (Brown & Braggins 1989)
Riccardia loefgrenii Schiffn., Denkschr. Österr. Akad. Wiss., Math.-Naturwiss. Kl. 111: 14. 1964. (Schiffner 1964)
Riccardia longiflora (Steph.) Hewson, Proc. Linn. Soc. New South Wales 95: 88. 1970. (Hewson 1970)

Basionym: Aneura longiflora Steph., Bull. Herb. Boissier 7(10): 746. 1899. (Stephani 1899a)
Riccardia longioleata Hässel, Revista Mus. Argent. Ci. Nat., Bernardino Rivadavia Inst. Nac. Invest. Ci. Nat., Bot. 4(1): 30. 1972. (Hässel de Menéndez 1972)
Riccardia longispica (Steph.) Pearson, Forh. Vidensk.-Selsk. Kristiania 1892(14): 4. 1893. (Pearson 1893)

Basionym: Aneura longispica Steph., Bot. Gaz. 15: 281. 1890. (Stephani 1890; Reeb & Gradstein 2020)
- =Aneura limbata Steph., Hedwigia 30: 203. 1891. (Reeb & Gradstein 2020) ≡Riccardia limbata (Steph.) E.W. Jones, Trans. Brit. Bryol. Soc. 3: 79. 1956. (Reeb & Gradstein 2020)
- =Aneura reticulata Steph., Hedwigia 30: 204. 1891. (Reeb & Gradstein 2020)
- =Aneura erosa Steph., Hedwigia 30: 269. 1891. (Reeb & Gradstein 2020) ≡Riccardia erosa (Steph.) E.W. Jones, Trans. Brit. Bryol. Soc. 3: 83. 1956. (Reeb & Gradstein 2020)
- =Aneura lepervanchei Steph., Sp. Hepat. (Stephani) 1: 255. 1899. (Reeb & Gradstein 2020)
- =Aneura congoensis Steph., Sp. Hepat. (Stephani) 6: 23. 1917. (Reeb & Gradstein 2020)
- =Aneura grosselimbata Steph., Sp. Hepat. (Stephani) 6: 29. 1917. (Reeb & Gradstein 2020)
- =Aneura holstii Steph., Sp. Hepat. (Stephani) 6: 31. 1917. (Reeb & Gradstein 2020) ≡Riccardia holstii (Steph.) E.W. Jones, Trans. Brit. Bryol. Soc. 3: 78. 1956.
- =Aneura piliflora Steph., Sp. Hepat. (Stephani) 6: 38. 1917. (Reeb & Gradstein 2020)
- =Aneura tenera Steph., Sp. Hepat. (Stephani) 6: 43. 1917. (Reeb & Gradstein 2020)
- =Riccardia reticulata S.W. Arnell, Bot. Not. 1952: 152. 1952. (Arnell 1952; Reeb & Gradstein 2020)
- =Riccardia kilimandjarica S.W. Arnell, Svensk Bot. Tidskr. 53(4): 543. 1959. (Reeb & Gradstein 2020)
Riccardia loriana (Steph.) H.A. Mill., Ark. Bot., n.s. 5: 528. 1963. (Miller 1963)

Basionym: Aneura loriana Steph., Bull. Herb. Boissier 7(10): 733. 1899. (Stephani 1899a)
Riccardia macdonaldiana Hewson, Proc. Linn. Soc. New South Wales 95: 93. 1970. (Hewson 1970)
Riccardia macrantha (Pearson) H.A. Mill., Phytologia 47: 324. 1981. (Miller 1981)

Basionym: Aneura macrantha Pearson, J. Linn. Soc., Bot. 46: 17. 1922. (Pearson et al. 1922)
Riccardia magnicellularis Furuki, J. Hattori Bot. Lab. 100: 93. 2006. (Furuki 2006)
Riccardia marginata (Colenso) Pearson, Univ. Calif. Publ. Bot. 10: 309. 1923. (Pearson 1923)

Basionym: Aneura marginata Colenso, Trans. & Proc. New Zealand Inst. 18: 253. 1886. (Colenso 1886; Brown & Braggins 1989)
- =Aneura muscoides Colenso, Trans. & Proc. New Zealand Inst. 18: 251. 1886. (Colenso 1886; Brown & Braggins 1989) ≡Riccardia muscoides (Colenso) E.A. Hodgs., Rec. Domin. Mus. 4: 130. 1962. (Brown & Braggins 1989)
Riccardia marginata (Colenso) Pearson var. marginata
Riccardia marginata var. pacifica Furuki, J. Hattori Bot. Lab. 70: 380. 1991. (Furuki 1991; Yamada & Iwatsuki 2006)
Riccardia marionensis R.M. Schust., J. Hattori Bot. Lab. 67: 65. 1989. (Schuster 1989)
Riccardia martinii Reeb & Gradst., Cryptog., Bryol. 41(2): 26. 2020. (Reeb & Gradstein 2020)
Riccardia meagheri Frank Müll., Bryoph. Diversity & Evol. 46(1): 51. 2023. (Müller 2023)
Riccardia mejlandii S.W. Arnell, Results Norweg. Sci. Exped. Tristan da Cunha 42: 30. 1958. (Arnell 1958)
- =Riccardia engelii Hässel, Revista Mus. Argent. Ci. Nat., Bernardino Rivadavia Inst. Nac. Invest. Ci. Nat., Bot. 4(1): 174. 1972. (Váňa & Engel 2013)
Riccardia microscopica (Nees) Kuntze, Revis. Gen. Pl.: 838. 1891. (Kuntze 1891)

Basionym: Aneura microscopica Nees, Syn. Hepat.: 500. 1846. (Gottsche et al. 1844)
Riccardia minuta (Steph.) W. Martin, Trans. & Proc. Roy. Soc. New Zealand 78: 499. 1950. (Martin 1950)

Basionym: Aneura minuta Steph., Sp. Hepat. (Stephani) 6: 34. 1917. (Stephani 1925)
Riccardia multicorpora E.A. Br., J. Hattori Bot. Lab. 66: 40. 1989. (Brown & Braggins 1989)
Riccardia multifida (L.) Gray, Nat. Arr. Brit. Pl. 1: 684. 1821. (Gray 1821)

Basionym: Jungermannia multifida L., Sp. Pl. 2: 1136. 1753. (Linnaeus 1753; Damsholt 2002)

≡Roemeria multifida (L.) Raddi, Jungermanniogr. Etrusca: 36. 1818. ≡Blasia multifida (L.) Fr., Stirp. Agri Femsion. 3: 31. 1825. (Fries 1825) ≡Metzgeria multifida (L.) Corda, Naturalientausch 12 [Opiz, Beitr. Naturgesch.]: 654. 1829. ≡Aneura multifida (L.) Dumort., Syll. Jungerm. Europ.: 85. 1831. (Paton 1999) ≡Gymnomitrion multifidum (L.) Huebener, Hepaticol. Germ.: 37. 1834. ≡Sarcomitrium multifidum (L.) Mitt., J. Bot. (Hooker) 3: 360. 1851. ≡Pseudoneura multifida (L.) Gottsche, Mexik. Leverm.: 259. 1863. ≡Aneura sinuata subsp. multifida (L.) Kavina, Arch. Prir. Vyzk. Cech 16(2): 192. 1915.
- =Anthoceros multifidus L., Sp. Pl.: 1140. 1753. (Linnaeus 1753; Proskauer 1948) ≡Carpoceros multifidus (L.) Dumort., Comment. Bot.: 77. 1822. ≡Anthoceros punctatus f. multifidus (L.) Nees, Naturgesch. Eur. Leberm. 4: 340. 1838. ≡Anthoceros punctatus var. multifidus (L.) Mont., Hist. Nat. Îles Canaries 3(2): 64. 1840.
- =Jungermannia bipinnata Sw., Prodr.: 145. 1788. (Swartz 1788; Gradstein 2013) ≡Aneura bipinnata (Sw.) Nees, Syn. Hepat.: 500. 1846. (Gradstein 2013) ≡Sarcomitrium bipinnatum (Sw.) Mitt., J. Bot. (Hooker) 3: 360. 1851. ≡Riccardia bipinnata (Sw.) Trevir., Mem. Reale Ist. Lombardo Sci., Ser. 3, Cl. Sci. Mat. 4: 431. 1877.
- =Jungermannia palmata var. multifida Wahlenb., Fl. Suec. (Wahlenberg) 2: 790. 1826. (Nees von Esenbeck 1838)
- =Jungermannia multifida var. crispa Lehm., Linnaea 4: 369. 1829. (Lehmann 1829)
- =Jungermannia rigida Huebener, Ann. Pharm. (Lemgo & Heidleberg) 7: 70. 1833, nom. illeg. (Schumacker & Váňa 2005)
- =Aneura multifida f. ambrosioides Nees, Naturgesch. Eur. Leberm. 3: 450, 452. 1838. ≡Riccardia multifida f. ambrosioides (Nees) Lindb., Hepat. Hibern.: 511. 1875. ≡Riccardia multifida var. ambrosioides (Nees) Carrington & Pearson, Hepat. Brit. Exsicc. 1: no. 63. 1878. (Carrington & Pearson 1878) ≡Aneura multifida var. ambrosioides (Nees) Pearson, List Canad. Hepat.: 26. 1890. ≡Aneura ambrosioides (Nees) Pearson, Hepat. Brit. Isl.: 453. 1902. (Schuster 1992) ≡Aneura sinuata f. ambrosioides (Nees) Kavina, Arch. Prir. Vyzk. Cech 16(2): 195. 1915.
- =Aneura multifida f. prolifera Nees, Naturgesch. Eur. Leberm. 3: 451. 1838. (Nees von Esenbeck 1838) ≡Aneura multifida var. prolifera (Nees) Debat, Fl. Musc.: 235. 1874.
- =Aneura multifida f. filiformis Nees, Naturgesch. Eur. Leberm. 3: 451, 452. 1838. (Nees von Esenbeck 1838) ≡Aneura multifida var. filiformis (Nees) Debat, Fl. Musc.: 235. 1874.
- =Jungermannia incisa Hook. f. & Taylor, London J. Bot. 4: 93. 1845, nom. illeg. (Gottsche et al. 1844) ≡Jungermannia multifida var. incisa Hook. f. & Taylor, Fl. Antarct. 1: 167. 1845. ≡Aneura multifida var. incisa (Hook. f. & Taylor) Gottsche, Lindenb. & Nees, Syn. Hepat.: 498. 1846.
- =Riccardia sinuata var. stenoclada Schiffn., Oesterr. Bot. Z. 58: 8. 1908. ≡Aneura sinuata f. stenoclada (Schiffn.) Kavina, Arch. Prir. Vyzk. Cech 16(2): 189. 1915. (Schumacker & Váňa 2005)
- =Aneura foreauana Steph., Sp. Hepat. (Stephani) 6: 26. 1917. (Srivastava & Udar 1976)
- =Aneura luetzelburgii Steph., Sp. Hepat. (Stephani) 6: 33. 1917. (Gradstein & Costa 2003)
Riccardia multifida subsp. decrescens (Steph.) Furuki, J. Hattori Bot. Lab. 70: 341. 1991. (Furuki 1991; Yamada & Iwatsuki 2006)

Basionym: Aneura decrescens Steph., Bull. Herb. Boissier 7(9): 686. 1899. (Stephani 1899b; Furuki 1991)

≡Riccardia decrescens (Steph.) S. Hatt., Bull. Tokyo Sci. Mus. 11: 165. 1944.
- =Aneura makinoana Steph., Sp. Hepat. (Stephani) 1: 244. 1899. (Yamada & Iwatsuki 2006) ≡Riccardia makinoana (Steph.) Yasuda, Shokub. Kak.: 687. 1911. (Yasuda 1911)
Riccardia multifida (L.) Gray subsp. multifida
Riccardia multifida subsp. synoica R.M. Schust., J. Hattori Bot. Lab. 62: 319. 1987. (Schuster 1987; Stotler & Crandall-Stotler 2017)
Riccardia multifidoides Schiffn., Denkschr. Kaiserl. Akad. Wiss., Wien Math.-Naturwiss. Kl. 67: 166. 1898. (Schiffner 1899a)

≡Aneura multifidoides (Schiffn.) Steph., Sp. Hepat. (Stephani) 1: 215. 1899.
- =Riccardia multifidoides f. subpalmata Schiffn., Denkschr. Kaiserl. Akad. Wiss., Wien Math.-Naturwiss. Kl. 67: 166. 1898. (Söderström et al. 2010)
Riccardia multioleata Hässel, Revista Mus. Argent. Ci. Nat., Bernardino Rivadavia Inst. Nac. Invest. Ci. Nat., Bot. 4(1): 195. 1972. (Hässel de Menéndez 1972)
Riccardia multispica (Steph.) S. Hatt., Bull. Tokyo Sci. Mus. 11: 164. 1944. (Hattori 1944)

Basionym: Aneura multispica Steph., Sp. Hepat. (Stephani) 6: 34. 1917. (Stephani 1925)
Riccardia mycophora A. Evans, Trans. Connecticut Acad. Arts Sci. 25: 175. 1921. (Evans 1921)
Riccardia nadeaudii (Steph.) Hürl., Bauhinia 5: 201. 1976. (Hürlimann 1976)

Basionym: Aneura nadeaudii Steph., Bull. Herb. Boissier 7(10): 750. 1899. (Stephani 1899a)
Riccardia nagasakiensis (Steph.) S. Hatt., Bull. Tokyo Sci. Mus. 11: 164. 1944. (Hattori 1944)

Basionym: Aneura nagasakiensis Steph., Sp. Hepat. (Stephani) 6: 34. 1917. (Stephani 1925)
- =Riccardia submersa Horik., J. Sci. Hiroshima Univ., Ser. B, Div. 2, Bot. 1: 198. 1933, nom. illeg. (Horikawa 1933; Yamada & Iwatsuki 2006)
Riccardia nana (Hook. f. & Taylor) Trevis., Mem. Reale Ist. Lombardo Sci., Ser. 3, Cl. Sci. Mat. 4: 431. 1877. (Trevisan de Saint-Léon 1877)

Basionym: Jungermannia multifida var. nana Hook. f. & Taylor, London J. Bot. 4: 95. 1845. (Hooker & Taylor 1845)

≡Aneura multifida var. nana (Hook. f. & Taylor) Gottsche, Lindenb. & Nees, Syn. Hepat.: 497. 1846. (Gottsche et al. 1844)
Riccardia negeri (Steph.) A. Evans, Trans. Connecticut Acad. Arts Sci. 25: 172. 1921. (Evans 1921)

Basionym: Aneura negeri Steph., Bull. Herb. Boissier 7(10): 747. 1899. (Stephani 1899a)
Riccardia newelliana (Steph.) H.A. Mill., Ark. Bot., n.s. 5: 528. 1963. (Miller 1963)

Basionym: Aneura newelliana Steph., Sp. Hepat. (Stephani) 6: 35. 1917. (Stephani 1925)
Riccardia nigra (Steph.) H.A. Mill., Ark. Bot., n.s. 5: 528. 1963. (Miller 1963)

Basionym: Aneura nigra Steph., Sp. Hepat. (Stephani) 6: 35. 1917. (Stephani 1925)
Riccardia nitida (Colenso) E.A. Hodgs., Trans. Roy. Soc. New Zealand, Bot. 3: 92. 1965. (Hodgson 1965)

Basionym: Aneura nitida Colenso, Trans. & Proc. New Zealand Inst. 18: 253. 1886. (Colenso 1886; Brown & Braggins 1989)
Riccardia nobilis (Steph.) Schiffn., Consp. Hepat. Arch. Ind.: 56. 1898. (Schiffner 1898)

Basionym: Aneura nobilis Steph., Hedwigia 32: 24. 1893. (Stephani 1893)
Riccardia novoamstelodamensis Schiffn., Deutsche Südpolar-Exped. 1901–1903, 8: 65. 1906. (Schiffner 1906)
- =Aneura novoamstelodamensis Schiffn., Deutsche Südpolar-Exped. 1901–1903, 8: 65. 1906. (Váňa et al. 2014)
Riccardia obtusifrons (Steph.) H.A. Mill., Ark. Bot., n.s. 5: 527. 1963. (Miller 1963)

Basionym: Aneura obtusifrons Steph., Sp. Hepat. (Stephani) 6: 36. 1917. (Stephani 1925)
Riccardia omkaliensis Hewson, Proc. Linn. Soc. New South Wales 95: 97. 1970. (Hewson 1970)
Riccardia opuntiiformis S.W. Arnell, Arch. Soc. Zool. Bot. Fenn. "Vanamo" 9: 52. 1954. (Arnell 1954)
- =Riccardia trichomatosa S.W. Arnell, Arch. Soc. Zool. Bot. Fenn. "Vanamo" 9: 54. 1954. (Arnell 1954; Hässel de Menéndez & Rubies 2009)
Riccardia pallida (Spruce) Meenks & C. De Jong, Cryptog. Bryol. Lichénol. 6: 15. 1985. (Meenks & De Jong 1985)

Basionym: Aneura pallida Spruce, Trans. & Proc. Bot. Soc. Edinburgh 15: 547. 1885. (Spruce 1884–1885; Gradstein & Reeb 2018b)
- =Aneura trichomanoides Spruce, Trans. & Proc. Bot. Soc. Edinburgh 15: 547. 1885. (Spruce 1884–1885; Gradstein & Reeb 2018b) ≡Riccardia trichomanoides (Spruce) Hässel ex Meenks, Beih. Nova Hedwigia 88: 101. 1987. (Schultze-Motel & Menzel 1987; Gradstein & Reeb 2018b)
- =Aneura capillacea Steph., Biblioth. Bot. 87: 174. 1916. (Gradstein & Reeb 2018b) ≡Riccardia capillacea (Steph.) Meenks & C. De Jong, Cryptog. Bryol. Lichénol. 6: 6. 1985. (Meenks & De Jong 1985; Gradstein & Reeb 2018b)
- =Aneura gracillima Steph., Biblioth. Bot. 87: 175. 1916. (Gradstein et al. 2003)
- =Aneura herzogiana Steph., Biblioth. Bot. 87: 175. 1916. (Gradstein & Reeb 2018b) ≡Riccardia herzogiana (Steph.) Meenks & C. De Jong, Cryptog. Bryol. Lichénol. 6: 12. 1985. (Meenks & De Jong 1985; Gradstein & Reeb 2018b)
- =Aneura lamellifera Steph., Biblioth. Bot. 87: 175. 1916. (Gradstein et al. 2003)
- =Aneura boliviensis Steph., Biblioth. Bot. 87: 176. 1916. (Gradstein & Reeb 2018b) ≡Riccardia boliviensis (Steph.) Meenks, J. Hattori Bot. Lab. 62: 170. 1987. (Meenks 1987; Gradstein & Reeb 2018b)
- =Aneura muscicola Steph., Biblioth. Bot. 87: 176. 1916. (Gradstein et al. 2003)
- =Riccardia foliacea Meenks & C. De Jong, Cryptog. Bryol. Lichénol. 6: 8. 1985. (Meenks & De Jong 1985; Gradstein 2021)
- =Riccardia capillacea var. dentata Meenks, J. Hattori Bot. Lab. 62: 170. 1987. (Meenks 1987; Gradstein & Reeb 2018b)
Riccardia pallidevirens (Steph.) A. Evans, Trans. Connecticut Acad. Arts Sci. 25: 189. 1921. (Evans 1921)

Basionym: Aneura pallidevirens Steph., Bull. Herb. Boissier 7(10): 762. 1899. (Stephani 1899a)
- =Riccardia laminaris Gola, Nuovo Giorn. Bot. Ital., n.s. 29: 163. 1923. (Hässel de Menéndez & Rubies 2009)
Riccardia palmata (Hedw.) Carruth., J. Bot. 3(10): 302. 1865. (Carruthers 1865)

Basionym: Jungermannia palmata Hedw., Theoria Generat. Fruct. Pl. Crypt.: 87, 152. 1784, nom. cons. (Hedwig 1784; Damsholt 2002)

≡Roemeria palmata (Hedw.) Raddi, Jungermanniogr. Etrusca: 36. 1818. ≡Metzgeria palmata (Hedw.) Corda, Naturalientausch 12 [Opiz, Beitr. Naturgesch.]: 654. 1829. ≡Aneura palmata (Hedw.) Dumort., Syll. Jungerm. Europ.: 86. 1831. (Paton 1999) ≡Jungermannia multifida var. palmata (Hedw.) Hartm., Handb. Skand. Fl. (ed. 2): 363. 1832. ≡Gymnomitrion palmatum (Hedw.) Huebener, Hepaticol. Germ.: 40. 1834. ≡Sarcomitrium palmatum (Hedw.) Corda, Deutschl. Fl., Abt. II, Cryptog. 26–27: 119. 1835.
- =Riccia fruticulosa O.F. Müll., Fl. Dan. 5(15): 6. 1782, nom. rej. (Grolle & So 2003) ≡Jungermannia fruticulosa (O.F. Müll.) Sm., Engl. Bot.: pl. 2514. 1813, nom. rej. (Grolle & So 2003) ≡Metzgeria furcata var. fruticulosa (O.F. Müll.) Lindb., Acta Soc. Fauna Fl. Fenn. 1(2): 40. 1877. ≡Metzgeria fruticulosa (O.F. Müll.) A. Evans, Ann. Bot. (Oxford) 24: 293. 1910, nom. rej. (Grolle & So 2003) ≡Metzgeria furcata f. fruticulosa (O.F. Müll.) Kavina, Arch. Prir. Vyzk. Cech 16(2): 231. 1915. ≡Metzgeria glabra f. fruticulosa (O.F. Müll.) Zodda, Fl. Ital. Crypt., Hepat.: 100. 1934, nom. illeg. (Zodda 1934)
- =Jungermannia polyphylla Sw., Prodr.: 145. 1788. (Swartz 1788; Söderström et al. 2011a) ≡Jungermannia palmata var. polyphylla (Sw.) Steud., Nomencl. Bot. 2: 227. 1824.
- =Aneura palmata f. arenaria Nees, Naturgesch. Eur. Leberm. 3: 459. 1838. (Nees von Esenbeck 1838)
- =Aneura palmata f. laxa Nees, Naturgesch. Eur. Leberm. 3: 459. 1838. (Bardat et al. 2021) ≡Aneura palmata var. laxa (Nees) Debat, Fl. Musc.: 235. 1874. ≡Riccardia palmata f. laxa (Nees) Dalla Torre & Sarnth., Fl. Tirol 5: 11. 1902.
- =Aneura palmata f. prolifera Nees, Naturgesch. Eur. Leberm. 3: 460. 1838. (Nees von Esenbeck 1838)
- =Aneura palmata f. saxicola Nees, Naturgesch. Eur. Leberm. 3: 460. 1838. (Nees von Esenbeck 1838)
- =Aneura palmata f. leptomera Nees, Naturgesch. Eur. Leberm. 3: 461. 1838. (Bernet 1888)
- =Aneura palmata f. attenuata Nees, Naturgesch. Eur. Leberm. 3: 462. 1838. (Nees von Esenbeck 1838)
- =Aneura palmata f. innovans Nees, Syn. Hepat.: 499. 1846. (Gottsche et al. 1844)
- =Aneura palmata f. chordacea Kavina, Arch. Prir. Vyzk. Cech 16(2): 201. 1915. (Kavina 1915)
- =Aneura palmata f. crispula Kavina, Arch. Prir. Vyzk. Cech 16(2): 201. 1915. (Kavina 1915)
- =Aneura tosana Steph., Sp. Hepat. (Stephani) 6: 44. 1917. (Yamada & Iwatsuki 2006) ≡Riccardia tosana (Steph.) S. Hatt., Bull. Tokyo Sci. Mus. 11: 164. 1944.
- =Aneura palmata f. elongata Meyl., Beitr. Kryptogamenfl. Schweiz 6(1): 103. 1924. ≡Riccardia palmata f. elongata (Meyl.) Verd., Ann. Bryol. 10: 128. 1938. (Verdoorn 1938)
Riccardia palmatifida (Steph.) H.A. Mill., Phytologia 47: 324. 1981. (Miller 1981)

Basionym: Aneura palmatifida Steph., Sp. Hepat. (Stephani) 6: 36. 1917. (Stephani 1925)
Riccardia papillosa (C. Massal. & Steph.) Hässel, Revista Mus. Argent. Ci. Nat., Bernardino Rivadavia Inst. Nac. Invest. Ci. Nat., Bot. 4(1): 60. 1972. (Hässel de Menéndez 1972)

Basionym: Aneura papillosa C. Massal. & Steph., Atti Reale Ist. Veneto Sci. Lett. Arti 87(2): 241. 1928. (Massalongo 1928)
Riccardia papulosa (Steph.) E.A. Br., J. Hattori Bot. Lab. 66: 49. 1989. (Brown & Braggins 1989)

Basionym: Aneura papulosa Steph., Hedwigia 32: 25. 1893. (Stephani 1893; Brown & Braggins 1989)
Riccardia parvula Schiffn., Denkschr. Kaiserl. Akad. Wiss., Wien Math.-Naturwiss. Kl. 67: 172. 1898. (Schiffner 1899a)

≡Aneura parvula (Schiffn.) Steph., Sp. Hepat. (Stephani) 1: 264. 1899.
Riccardia patens Hässel, Revista Mus. Argent. Ci. Nat., Bernardino Rivadavia Inst. Nac. Invest. Ci. Nat., Bot. 4: 165. 1972. (Hässel de Menéndez 1972)
Riccardia pauciramea (Steph.) H.A. Mill., Ark. Bot., n.s. 5: 527. 1963. (Miller 1963)

Basionym: Aneura pauciramea Steph., Bull. Herb. Boissier 5: 845. 1897. (Stephani 1897)
Riccardia paulensis Schiffn., Denkschr. Österr. Akad. Wiss., Math.-Naturwiss. Kl. 111: 16. 1964. (Schiffner 1964)
Riccardia pectinata (Austin) H.A. Mill., Ark. Bot., n.s. 5: 526. 1963. (Miller 1963)

Basionym: Aneura pectinata Austin, Bull. Torrey Bot. Club 5(3): 15. 1874. (Austin 1874)
Riccardia pectinata var. fasciculata (Steph.) Hürl., Bauhinia 5: 208. 1976. (Hürlimann 1976; Miller et al. 1983)

Basionym: Aneura fasciculata Steph., Sp. Hepat. (Stephani) 6: 25. 1917. (Stephani 1925; Hürlimann 1976)
Riccardia pectinata (Austin) H.A. Mill. var. pectinata
Riccardia pellucida Piippo, J. Hattori Bot. Lab. 68: 134. 1990. (Piippo 1990)

Replaced synonym: Aneura pellucida Steph., Sp. Hepat. (Stephani) 6: 37. 1917, nom. illeg. (Stephani 1925)
Riccardia pembaiensis (Steph.) Hürl., Bauhinia 5: 205. 1976. (Hürlimann 1976)

Basionym: Aneura pembaiensis Steph., Sp. Hepat. (Stephani) 6: 37. 1917. (Stephani 1925)
Riccardia pengagensis Hewson, Proc. Linn. Soc. New South Wales 95: 108. 1970. (Hewson 1970)
Riccardia pennata E.A. Br., J. Hattori Bot. Lab. 66: 53. 1989. (Brown & Braggins 1989)
Riccardia perspicua E.A. Br., J. Hattori Bot. Lab. 66: 55. 1989. (Brown & Braggins 1989)
Riccardia perssonii S.C. Srivast. & Udar, Lindbergia 4: 127. 1977. (Srivastava & Udar 1977)
Riccardia philippinensis Furuki, J. Hattori Bot. Lab. 100: 94. 2006. (Furuki 2006)
Riccardia phleganiana Hewson, Proc. Linn. Soc. New South Wales 95: 80. 1970. (Hewson 1970)
Riccardia pindaundensis Hewson, Proc. Linn. Soc. New South Wales 95: 78. 1970. (Hewson 1970)
Riccardia pindensis Hewson, Proc. Linn. Soc. New South Wales 95: 87. 1970. (Hewson 1970)
Riccardia plana (Steph.) Hürl., Bauhinia 5: 205. 1976. (Hürlimann 1976)

Basionym: Aneura plana Steph., Sp. Hepat. (Stephani) 6: 38. 1917. (Stephani 1925; Hürlimann 1976)
Riccardia plana var. minor (Pearson) Hürl. ex H.A. Mill., H. Whittier & B. Whittier, Bryophyt. Biblioth. 25: 303. 1983. (Miller et al. 1983)

Basionym: Aneura plana var. minor Pearson, J. Linn. Soc., Bot. 46(305): 16. 1922. (Pearson et al. 1922)
Riccardia plana (Steph.) Hürl. var. plana
Riccardia planiflora (Steph.) S. Hatt., Bull. Tokyo Sci. Mus. 11: 164. 1944. (Hattori 1944)

Basionym: Aneura planiflora Steph., Sp. Hepat. (Stephani) 6: 38. 1917. (Stephani 1925)
- =Aneura rigida Steph., Sp. Hepat. (Stephani) 6: 40. 1917. (Yamada & Iwatsuki 2006) ≡Riccardia rigida (Steph.) S. Hatt., Bull. Tokyo Sci. Mus. 11: 164. 1944, nom. illeg. ≡Riccardia uematsuana S. Hatt., Nat. Sci. Mus. 15: 77. 1944.
Riccardia planiflora var. aequatorialis Furuki, Nat. Hist. Res. 4(2): 77. 1997. (Furuki 1997; Lee et al. 2022)
Riccardia planiflora (Steph.) S. Hatt. var. planiflora
Riccardia plumosa (Mitt.) E.O. Campb., J. Roy. Soc. New Zealand 1: 24. 1971. (Campbell 1971)

Basionym: Sarcomitrium plumosum Mitt., Bonplandia (Hannover) 10: 19. 1862. (Mitten 1862)

≡Aneura plumosa (Mitt.) Steph., Sp. Hepat. (Stephani) 1: 218. 1899.
- =Aneura zollingeri Steph., Hedwigia 27: 277. 1888. (Stephani 1888; Söderström et al. 2010) ≡Riccardia zollingeri (Steph.) Schiffn., Consp. Hepat. Arch. Ind.: 58. 1898. ≡Riccardia elata var. zollingeri (Steph.) Schiffn., Denkschr. Kaiserl. Akad. Wiss., Wien Math.-Naturwiss. Kl. 67: 169. 1898.
- =Aneura goebelii Schiffn., Nova Acta Acad. Caes. Leop.-Carol. German. Nat. Cur. 60: 273. 1893. (Söderström et al. 2010) ≡Riccardia goebelii (Schiffn.) Schiffn., Consp. Hepat. Arch. Ind.: 55. 1898. ≡Riccardia elata var. goebelii (Schiffn.) Schiffn., Denkschr. Kaiserl. Akad. Wiss., Wien Math.-Naturwiss. Kl. 67: 169. 1898.
- =Aneura reineckeana Steph., Sp. Hepat. (Stephani) 6: 40. 1917. (Hürlimann 1976) ≡Riccardia reineckeana (Steph.) Grolle, J. Hattori Bot. Lab. 36: 76. 1972[1973].
Riccardia poeppigiana (Lehm. & Lindenb.) Hässel ex Meenks & C. De Jong, Cryptog. Bryol. Lichénol. 6: 17. 1985. (Meenks & De Jong 1985)

Basionym: Jungermannia poeppigiana Lehm. & Lindenb., Nov. Stirp. Pug. 6: 23. 1834. (Lehmann 1834)

≡Metzgeria poeppigiana (Lehm. & Lindenb.) Lindenb., Syn. Hepat. (fasc. 4): 506. 1846. ≡Pseudoneura poeppigiana (Lehm. & Lindenb.) Gottsche, Mexik. Leverm.: 261. 1863. ≡Acrostolia poeppigiana (Lehm. & Lindenb.) Trevis., Mem. Reale Ist. Lombardo Sci., Ser. 3, Cl. Sci. Mat. 4: 431. 1877. ≡Aneura poeppigiana (Lehm. & Lindenb.) Steph., Sp. Hepat. (Stephani) 1: 228. 1899.
- =Metzgeria algoides Taylor, London J. Bot. 5: 410. 1846. ≡Sarcomitrium algoides (Taylor) Mitt., J. Bot. (Hooker) 3: 360. 1851. ≡Acrostolia algoides (Taylor) Trevis., Mem. Reale Ist. Lombardo Sci., Ser. 3, Cl. Sci. Mat. 4: 431. 1877. ≡Aneura algoides (Taylor) Steph., Sp. Hepat. (Stephani) 1: 223. 1899. ≡Riccardia algoides (Taylor) Meenks, J. Hattori Bot. Lab. 62: 168. 1987. (Meenks 1987; Gradstein & Reeb 2018b)
- =Aneura cervicornis Spruce, Trans. & Proc. Bot. Soc. Edinburgh 15: 550. 1885. (Spruce 1884–1885; Gradstein & Reeb 2018b) ≡Riccardia cervicornis (Spruce) Herzog ex Gradst. & Hekking, J. Hattori Bot. Lab. 45: 129. 1979. (Gradstein & Hekking 1979; Gradstein & Reeb 2018b)
- =Aneura squarrosa Steph., Hedwigia 32: 26. 1893. (Gradstein & Reeb 2018b) ≡Riccardia squarrosa (Steph.) Gradst., J. Hattori Bot. Lab. 45: 130. 1979. (Gradstein & Hekking 1979)
Riccardia polyclada (Mitt.) Hässel, Bryologist 109: 34. 2006. (Hässel de Menéndez 2006)

Basionym: Aneura polyclada Mitt., Trans. Linn. Soc. London, Bot. 2(13): 297. 1887. (Mitten 1887)
- =Aneura umbrosa Schiffn., Forschungsr. Gazelle 4(4): 42. 1889. (Hässel de Menéndez & Rubies 2009) ≡Riccardia umbrosa (Schiffn.) Hässel, Revista Mus. Argent. Ci. Nat., Bernardino Rivadavia Inst. Nac. Invest. Ci. Nat., Bot. 4(1): 184. 1972.
- =Pseudoneura crispa Schiffn., Forschungsr. Gazelle 4(4): 41. 1889[1890]. ≡Aneura crispa (Schiffn.) Steph., Hedwigia 32: 137. 1893, nom. illeg. ≡Riccardia crispa (Schiffn.) A. Evans, Trans. Connecticut Acad. Arts Sci. 25: 131. 1921. (Hässel de Menéndez & Rubies 2009)
- =Aneura endiviifolia K.I. Goebel, Organogr. Pfl. 2: 279. 1900. (Hässel de Menéndez & Rubies 2009)
- =Aneura chilensis Steph., Kongl. Svenska Vetensk. Acad. Handl., n.s. 46(9): 6. 1911. (Hässel de Menéndez & Rubies 2009) ≡Riccardia chilensis (Steph.) A. Evans, Trans. Connecticut Acad. Arts Sci. 25: 145. 1921.
Riccardia porcina (Hewson) L. Söderstr., Phytotaxa 202(1): 70. 2015. (Söderström et al. 2015)

Basionym: Riccardia bliklika var. porcina Hewson, Proc. Linn. Soc. New South Wales 95: 84. 1970. (Hewson 1970)
Riccardia portoricensis (Steph.) Pagán, Bryologist 42: 7. 1939. (Pagán 1939)

Basionym: Aneura portoricensis Steph., Bull. Herb. Boissier 7(10): 739. 1899. (Stephani 1899a)
Riccardia prehensilis (Hook. f. & Taylor) C. Massal., Nuovo Giorn. Bot. Ital. 17: 255. 1885. (Massalongo 1885)

Basionym: Jungermannia prehensilis Hook. f. & Taylor, London J. Bot. 3: 480. 1844. (Hooker & Taylor 1844)

≡Metzgeria prehensilis (Hook. f. & Taylor) Gottsche, Lindenb. & Nees, Syn. Hepat. (fasc. 4): 505. 1846. (Gottsche et al. 1844) ≡Sarcomitrium prehensile (Hook. f. & Taylor) Mitt., Fl. Nov.-Zel. 2: 167. 1855. ≡Aneura prehensilis (Hook. f. & Taylor) Mitt., Handb. N. Zeal. Fl.: 543. 1867. (Hässel de Menéndez & Rubies 2009) ≡Acrostolia prehensilis (Hook. f. & Taylor) Trevis., Mem. Reale Ist. Lombardo Sci., Ser. 3, Cl. Sci. Mat. 4: 431. 1877. ≡Pseudoneura prehensilis (Hook. f. & Taylor) Schiffn., Forschungsr. Gazelle 4(4): 41. 1889[1890].
- =Metzgeria eriocaula var. chilensis Gottsche, Lindenb. & Nees, Syn. Hepat.: 505. 1846. ≡Riccardia eriocaula var. chilensis (Gottsche, Lindenb. & Nees) Besch. & C. Massal., Miss. Sci. Cape Horn, Bot. 5: 244. 1889. (Hässel de Menéndez & Rubies 2009) ≡Pseudoneura eriocaula var. chilensis (Gottsche, Lindenb. & Nees) Schiffn., Forschungsr. Gazelle 4(4): 41. 1889[1890].
- =Aneura savatieri Steph., Hedwigia 32: 26. 1893. (Hässel de Menéndez & Rubies 2009) ≡Riccardia savatieri (Steph.) A. Evans, Trans. Connecticut Acad. Arts Sci. 25: 124. 1921. (Váňa & Engel 2013) ≡Aneura prehensilis var. savatieri (Steph.) C. Massal., Atti Reale Ist. Veneto Sci. Lett. Arti 87(2): 241. 1928.
- =Aneura lindaviana Steph., Sp. Hepat. (Stephani) 6: 33. 1917. (Hässel de Menéndez & Rubies 2009)
Riccardia pseudodendroceros R.M. Schust. ex M.A.M. Renner, Telopea 25: 354. 2022. (Renner 2022)
Riccardia pumila Furuki, J. Hattori Bot. Lab. 70: 361. 1991. (Furuki 1991)
Riccardia punahuina (Steph.) H.A. Mill., Ark. Bot., n.s. 5: 526. 1963. (Miller 1963)

Basionym: Aneura punahuina Steph., Sp. Hepat. (Stephani) 6: 39. 1917. (Stephani 1925)
Riccardia pusilla Grolle, J. Jap. Bot. 41: 231. 1966. (Grolle 1966a)

Replaced synonym: Riccardia nana Mizut. & S. Hatt., J. Hattori Bot. Lab. 18: 53. 1957, nom. illeg. (Mizutani & Hattori 1957)
Riccardia ramosissima (Steph.) Grolle, Bryophyt. Biblioth. 48: 130. 1995. (Grolle 1995)

Basionym: Aneura ramosissima Steph., Bull. Soc. Roy. Bot. Belgique 30(2): 196. 1891[1892]. (Renauld & Cardot 1891; Reeb & Gradstein 2020)
- =Aneura compacta Steph., Hedwigia 32: 19. 1893. (Reeb & Gradstein 2020) ≡Riccardia compacta (Steph.) S.W. Arnell, Bot. Not. 1952: 141. 1952. (Arnell 1952; Reeb & Gradstein 2020)
Riccardia regnellii (Ångstr.) K.G. Hell, Bol. Fac. Filos. Univ. São Paulo, Bot. 25: 110. 1969. (Hell 1969)

Basionym: Pseudoneura regnellii Ångstr., Öfvers. Kongl. Vetensk.-Akad. Förh. 33(7): 90. 1876. (Ångström 1876)

≡Aneura regnellii (Ångstr.) Steph., Sp. Hepat. (Stephani) 1: 214. 1899. (Gradstein & Reeb 2018a)
- =Jungermannia bipinnata var. flabellifera Nees, Fl. Bras. Enum. Pl. 1: 326. 1833. ≡Aneura bipinnata var. flabellifera (Nees) Gottsche, Lindenb. & Nees, Syn. Hepat.: 500. 1846. (Gradstein 2013)
- =Aneura amazonica Spruce, Trans. & Proc. Bot. Soc. Edinburgh 15: 545. 1885. (Spruce 1884–1885; Gradstein & Reeb 2018a) ≡Riccardia amazonica (Spruce) Schiffn. ex Gradst. & Hekking, J. Hattori Bot. Lab. 45: 129. 1979. (Gradstein & Hekking 1979; Gradstein & Reeb 2018a)
- =Aneura fendleri Steph., Hedwigia 32: 20. 1893. ≡Riccardia fendleri (Steph.) Pagán, Bryologist 45: 80. 1942. (Reeb et al. 2022)
- =Aneura subsimplex Steph., Hedwigia 32: 27. 1893. ≡Riccardia subsimplex (Steph.) Pagán, Bryologist 45: 81. 1942. (Reeb et al. 2022)
- =Aneura planifrons Spruce, J. Linn. Soc., Bot. 30: 368. 1895. ≡Riccardia planifrons (Spruce) Pagán, Bryologist 45: 80. 1942. (Reeb et al. 2022)
Riccardia regularis (Steph.) Kühnem., Revista Centro Estud. Doct. Ci. Nat. 1: 171. 1937. (Kühnemann 1937)

Basionym: Aneura regularis Steph., Kongl. Svenska Vetensk. Acad. Handl., n.s. 46(9): 9. 1911. (Stephani 1911)
Riccardia reyesiana Meenks, Acta Bot. Hung. 32: 207. 1986. (Meenks 1986)
Riccardia riccioides Pearson, Univ. Calif. Publ. Bot. 10: 310. 1923. (Pearson 1923)
Riccardia rigida Schiffn., Denkschr. Kaiserl. Akad. Wiss., Wien Math.-Naturwiss. Kl. 67: 172. 1898. (Schiffner 1899a)
Riccardia rivularis Hässel, Revista Mus. Argent. Ci. Nat., Bernardino Rivadavia Inst. Nac. Invest. Ci. Nat., Bot. 4: 52. 1972. (Hässel de Menéndez 1972)
Riccardia robbinsii Hewson & Grolle, J. Hattori Bot. Lab. 29: 72. 1966. (Grolle 1966b)
Riccardia robusta (Steph.) H.A. Mill., Phytologia 47: 324. 1981. (Miller 1981)

Basionym: Aneura robusta Steph., Sp. Hepat. (Stephani) 6: 40. 1917. (Stephani 1925)
Riccardia rockii (Steph.) H.A. Mill., Ark. Bot., n.s. 5: 527. 1963. (Miller 1963)

Basionym: Aneura rockii Steph., Sp. Hepat. (Stephani) 6: 41. 1917. (Stephani 1925)
Riccardia rupicola (Steph.) Hewson, Proc. Linn. Soc. New South Wales 95: 99. 1970. (Hewson 1970)

Basionym: Aneura rupicola Steph., Sp. Hepat. (Stephani) 6: 41. 1917. (Stephani 1925)
Riccardia russellii R.M. Schust., J. Hattori Bot. Lab. 67: 93. 1989. (Schuster 1989)
Riccardia saccatiflora (Steph.) S.W. Arnell, Bot. Not. 1952: 144. 1952. (Arnell 1952)

Basionym: Aneura saccatiflora Steph., Bot. Gaz. 15: 282. 1890. (Stephani 1890; Reeb & Gradstein 2020)
- =Aneura dismieri Steph., Sp. Hepat. (Stephani) 6: 24. 1917. (Reeb & Gradstein 2020)
- =Aneura papulosa Steph., Sp. Hepat. (Stephani) 6: 37. 1917, nom. illeg. (Reeb & Gradstein 2020)
- =Riccardia obtusa S.W. Arnell, Bot. Not. 1952: 142. 1952. (Arnell 1952; Reeb & Gradstein 2020)
- =Riccardia rhodesiae S.W. Arnell, Bot. Not. 1952: 150. 1952. (Arnell 1952; Reeb & Gradstein 2020)
Riccardia santapaui Udar & K.P. Srivast., Rev. Bryol. Lichénol. 39: 155. 1973. (Udar & Srivastava 1973)
Riccardia saxicola Hässel, Revista Mus. Argent. Ci. Nat., Bernardino Rivadavia Inst. Nac. Invest. Ci. Nat., Bot. 4(1): 137. 1972. (Hässel de Menéndez 1972)
Riccardia schwaneckei (Steph.) Pagán, Bryologist 42: 7. 1939. (Pagán 1939)

Basionym: Aneura schwaneckei Steph., Hedwigia 27: 278. 1888. (Stephani 1888)
Riccardia sikkimensis (Steph.) S.C. Srivast. & Udar, Biol. Mem. 1(1/2): 135. 1976. (Srivastava & Udar 1976; Singh & Singh 2017)

Basionym: Aneura sikkimensis Steph., Sp. Hepat. (Stephani) 6: 42. 1917. (Stephani 1925)
Riccardia singapurensis Schiffn., Denkschr. Kaiserl. Akad. Wiss., Wien Math.-Naturwiss. Kl. 67: 165. 1898. (Schiffner 1899a; Furuki & Tan 2013)

≡Aneura singapurensis (Schiffn.) Steph., Sp. Hepat. (Stephani) 1: 249. 1899.
- =Riccardia bliklika Hewson, Proc. Linn. Soc. New South Wales 95: 83. 1970. (Hewson 1970; Furuki & Tan 2013)
Riccardia spectabilis (Steph.) A. Evans, Trans. Connecticut Acad. Arts Sci. 25: 140. 1921. (Evans 1921)

Basionym: Aneura spectabilis Steph., Bull. Herb. Boissier 7: 746. 1899. (Stephani 1899a)
Riccardia spegazziniana C. Massal., Nuovo Giorn. Bot. Ital. 17: 254. 1885. (Massalongo 1885)

≡Aneura spegazziniana (C. Massal.) Steph., Sp. Hepat. (Stephani) 1: 257. 1899.
- =Aneura spiniloba Steph., Kongl. Svenska Vetensk. Acad. Handl., n.s. 46(9): 9. 1911. (Hässel de Menéndez & Rubies 2009)
Riccardia spinulifera C. Massal., Nuovo Giorn. Bot. Ital. 17: 254. 1885. (Massalongo 1885)

≡Aneura spinulifera (C. Massal.) Steph., Sp. Hepat. (Stephani) 1: 248. 1899. (Hässel de Menéndez & Rubies 2009)
- =Riccardia spinulifera var. scabrifrons C. Massal., Nuovo Giorn. Bot. Ital. 17(3): 255. 1885. (Hässel de Menéndez & Rubies 2009) ≡Aneura spinulifera var. scabrifrons (C. Massal.) C. Massal., Atti Reale Ist. Veneto Sci. Lett. Arti 87(2): 242. 1928.
- =Spinella magellanica Schiffn., Forschungsr. Gazelle 4(Lebermoose): 42. 1890, nom. illeg. (Hässel de Menéndez & Rubies 2009)
Riccardia spongiosa Furuki, J. Hattori Bot. Lab. 70: 385. 1991. (Furuki 1991)
Riccardia squamifera Schiffn., Denkschr. Österr. Akad. Wiss., Math.-Naturwiss. Kl. 111: 19. 1964. (Schiffner 1964)
- =Riccardia squamifera f. terricola Schiffn., Denkschr. Österr. Akad. Wiss., Math.-Naturwiss. Kl. 111: 20. 1964. (Yano 2008)
Riccardia statensis Hässel, Revista Mus. Argent. Ci. Nat., Bernardino Rivadavia Inst. Nac. Invest. Ci. Nat., Bot. 4(1): 177. 1972. (Hässel de Menéndez 1972)
Riccardia stipatiflora (Steph.) Pagán, Bryologist 45: 81. 1942. (Pagán 1942)

Basionym: Aneura stipatiflora Steph., Hedwigia 32: 27. 1893. (Stephani 1893)
Riccardia stricta R.M. Schust., J. Hattori Bot. Lab. 62: 326. 1987. (Schuster 1987)
Riccardia subalpina Furuki, J. Hattori Bot. Lab. 70: 367. 1991. (Furuki 1991)
Riccardia subantarctica R.M. Schust. ex Grolle & L. Söderstr., Phytotaxa 202(1): 70. 2015. (Söderström et al. 2015)

Replaced synonym: Riccardia pauciramea R.M. Schust., J. Hattori Bot. Lab. 67: 102. 1989, nom. illeg. (Schuster 1989)
Riccardia subexalata Schiffn., Denkschr. Kaiserl. Akad. Wiss., Wien Math.-Naturwiss. Kl. 67: 163. 1898. (Schiffner 1899a)

≡Aneura subexalata (Schiffn.) Steph., Sp. Hepat. (Stephani) 1: 261. 1899. (Söderström et al. 2010)
- =Aneura subexalata f. granulata Herzog, Mitt. Inst. Allg. Bot. Hamburg 7(3): 184. 1931. (Herzog 1931)
Riccardia subexalata var. procera Schiffn., Denkschr. Kaiserl. Akad. Wiss., Wien Math.-Naturwiss. Kl. 67: 164. 1898. (Schiffner 1899a; Söderström et al. 2010)
Riccardia subexalata Schiffn. var. subexalata
Riccardia submersa (Hook. f. & Taylor) Trevis., Mem. Reale Ist. Lombardo Sci., Ser. 3, Cl. Sci. Mat. 4: 431. 1877. (Trevisan de Saint-Léon 1877)

Basionym: Jungermannia multifida var. submersa Hook. f. & Taylor, London J. Bot. 4: 94. 1845. (Hooker & Taylor 1845)

≡Aneura multifida var. submersa (Hook. f. & Taylor) Gottsche, Lindenb. & Nees, Syn. Hepat.: 497. 1846. (Gottsche et al. 1844)
Riccardia submultifida Horik., J. Sci. Hiroshima Univ., Ser. B, Div. 2, Bot. 2: 128. 1934. (Horikawa 1934)
Riccardia subpalmata (Steph.) Hürl., Bauhinia 5: 194. 1976. (Hürlimann 1976)

Basionym: Aneura subpalmata Steph., Sp. Hepat. (Stephani) 6: 43. 1917. (Stephani 1925)
Riccardia sumatrana Schiffn., Denkschr. Kaiserl. Akad. Wiss., Wien Math.-Naturwiss. Kl. 67: 173. 1898. (Schiffner 1899a)

≡Aneura sumatrana (Schiffn.) Steph., Sp. Hepat. (Stephani) 1: 266. 1899.
Riccardia tahitensis (Steph.) Hürl., Bauhinia 5: 201. 1976. (Hürlimann 1976)

Basionym: Aneura tahitensis Steph., Bull. Herb. Boissier 7(10): 728. 1899. (Stephani 1899a)
Riccardia tamariscina (Steph.) Schiffn., Consp. Hepat. Arch. Ind.: 58. 1898. (Schiffner 1898)

Basionym: Aneura tamariscina Steph., Hedwigia 32: 27. 1893. (Stephani 1893)
Riccardia tenax (Steph.) A. Evans, Trans. Connecticut Acad. Arts Sci. 25: 186. 1921. (Evans 1921)

Basionym: Aneura tenax Steph., Bull. Herb. Boissier 7: 755. 1899. (Stephani 1899a)
- =Aneura nudimitra Steph., Sp. Hepat. (Stephani) 6: 35. 1917. (Hässel de Menéndez & Rubies 2009) ≡Riccardia nudimitra (Steph.) A. Evans, Trans. Connecticut Acad. Arts Sci. 25: 177. 1921. (Váňa & Engel 2013)
Riccardia tenella Hewson, Proc. Linn. Soc. New South Wales 95: 95. 1970. (Hewson 1970)
Riccardia tenerrima (Steph.) A. Evans, Trans. Connecticut Acad. Arts Sci. 25: 164. 1921. (Evans 1921)

Basionym: Aneura tenerrima Steph., Kongl. Svenska Vetensk. Acad. Handl., n.s. 46(9): 9. 1911. (Stephani 1911)
- =Riccardia adglutinata A. Evans, Nat. Hist. Juan Fernandez 2: 561. 1930. (Evans 1930; Hässel de Menéndez & Rubies 2009)
Riccardia tenuifrons (Steph.) Schiffn. ex O. Yano, Bol. Inst. Bot. (São Paulo) 19: 72. 2008. (Yano 2008)

Basionym: Aneura tenuifrons Steph., Sp. Hepat. (Stephani) 6: 44. 1917. (Stephani 1925)
Riccardia tenuis (Steph.) Schiffn., Denkschr. Kaiserl. Akad. Wiss., Wien Math.-Naturwiss. Kl. 67: 172. 1898. (Schiffner 1899a)

Basionym: Aneura tenuis Steph., Hedwigia 32: 28. 1893. (Stephani 1893)
Riccardia thaxteri A. Evans, Trans. Connecticut Acad. Arts Sci. 25: 126. 1921. (Evans 1921)
Riccardia theliophora Hässel, Revista Mus. Argent. Ci. Nat., Bernardino Rivadavia Inst. Nac. Invest. Ci. Nat., Bot. 4(1): 96. 1972. (Hässel de Menéndez 1972)
Riccardia tjibodensis Schiffn., Denkschr. Kaiserl. Akad. Wiss., Wien Math.-Naturwiss. Kl. 67: 165. 1898. (Schiffner 1899a)

≡Aneura tjibodensis (Schiffn.) Steph., Sp. Hepat. (Stephani) 1: 238. 1899.
Riccardia tristaniana S.W. Arnell, Results Norweg. Sci. Exped. Tristan da Cunha 42: 31. 1958. (Arnell 1958)
- =Riccardia hatcheri Hässel, Revista Mus. Argent. Ci. Nat., Bernardino Rivadavia Inst. Nac. Invest. Ci. Nat., Bot. 4(1): 171. 1972. (Váňa & Engel 2013)
Riccardia trukensis H.A. Mill. & Bonner, Beih. Nova Hedwigia 11: 70. 1963. (Miller et al. 1963)
Riccardia tumbareriensis Hewson, Proc. Linn. Soc. New South Wales 95: 87. 1970. (Hewson 1970)
Riccardia udarii D. Singh & D.K. Singh, Taiwania 62(1): 39. 2017. (Singh & Singh 2017)
Riccardia umida E.A. Br., J. Hattori Bot. Lab. 66: 38. 1989. (Brown & Braggins 1989)
Riccardia upoluna (Steph.) Grolle, J. Hattori Bot. Lab. 36: 77. 1972[1973]. (Grolle & Schultze-Motel 1972)

Basionym: Aneura upoluna Steph., Denkschr. Kaiserl. Akad. Wiss., Wien Math.-Naturwiss. Kl. 91: 165. 1915. (Rechinger 1915)
Riccardia valida (Steph.) J.J. Engel, Bryologist 78: 362. 1975. (Engel 1975)

Basionym: Aneura valida Steph., Sp. Hepat. (Stephani) 6: 44. 1917. (Stephani 1925)
Riccardia venosa (Steph.) Hürl., Bauhinia 5: 208. 1976. (Hürlimann 1976)

Basionym: Aneura venosa Steph., Sp. Hepat. (Stephani) 6: 45. 1917. (Stephani 1925)
Riccardia verticillata Gradst. & Reeb, J. Bryol. 41(4): 323. 2019. (Gradstein et al. 2019)
Riccardia villosa (Steph.) S.C. Srivast. & Udar, Biol. Mem. 1: 129. 1976. (Srivastava & Udar 1976)

Basionym: Aneura villosa Steph., Sp. Hepat. (Stephani) 6: 45. 1917. (Stephani 1925)
Riccardia virens (Steph.) Hürl., Bauhinia 5: 209. 1976. (Hürlimann 1976)

Basionym: Aneura virens Steph., Sp. Hepat. (Stephani) 6: 45. 1917. (Stephani 1925)
Riccardia vitrea Furuki, J. Hattori Bot. Lab. 70: 327. 1991. (Furuki 1991)
Riccardia vohimanensis Reeb & Gradst., Cryptog., Bryol. 41(2): 31. 2020. (Reeb & Gradstein 2020)
Riccardia wallisii (Steph.) Gradst., J. Hattori Bot. Lab. 45: 130. 1979. (Gradstein & Hekking 1979)

Basionym: Aneura wallisii Steph., Hedwigia 32: 28. 1893. (Stephani 1893; Gradstein & Reeb 2018b)
- =Riccardia judithae Meenks & C. De Jong, Cryptog. Bryol. Lichénol. 6: 12. 1985. (Meenks & De Jong 1985; Gradstein 2021)
- =Riccardia regina Meenks & C. De Jong, Cryptog. Bryol. Lichénol. 6: 17. 1985. (Meenks & De Jong 1985; Gradstein 2021)
- =Riccardia smaragdina Meenks & C. De Jong, Cryptog. Bryol. Lichénol. 6: 20. 1985. (Meenks & De Jong 1985; Gradstein & Reeb 2018b)
Riccardia wettsteinii Schiffn., Denkschr. Kaiserl. Akad. Wiss., Wien Math.-Naturwiss. Kl. 67: 162. 1898. (Schiffner 1899a)

≡Aneura wettsteinii (Schiffn.) Steph., Sp. Hepat. (Stephani) 1: 243. 1899.
Riccardia wettsteinii var. angustilimbia Schiffn., Denkschr. Kaiserl. Akad. Wiss., Wien Math.-Naturwiss. Kl. 67: 163. 1898. (Schiffner 1899a; Söderström et al. 2010)
Riccardia wettsteinii var. crassa Schiffn., Denkschr. Kaiserl. Akad. Wiss., Wien Math.-Naturwiss. Kl. 67: 163. 1898. (Schiffner 1899a; Söderström et al. 2010)
Riccardia wettsteinii var. procera Schiffn., Denkschr. Kaiserl. Akad. Wiss., Wien Math.-Naturwiss. Kl. 67: 162. 1898. (Schiffner 1899a; Söderström et al. 2010)
Riccardia wettsteinii var. tenuiretis Schiffn., Denkschr. Kaiserl. Akad. Wiss., Wien Math.-Naturwiss. Kl. 67: 162. 1898. (Schiffner 1899a; Söderström et al. 2010)
Riccardia wettsteinii Schiffn. var. wettsteinii
Riccardia womersleyana Hewson, Proc. Linn. Soc. New South Wales 95: 98. 1970. (Hewson 1970)
Riccardia xylophila Hässel, Revista Mus. Argent. Ci. Nat., Bernardino Rivadavia Inst. Nac. Invest. Ci. Nat., Bot. 4(1): 156. 1972. (Hässel de Menéndez 1972)

A Synopsis of Riccardia

References (198)