Between brackets is the number of accepted species
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- Biota
- Kingdom Animalia
- Kingdom Archaea
- Kingdom Bacteria
- Kingdom Chromista
- Kingdom Fungi
- Kingdom Plantae
- Phylum Acritarcha †
- Phylum Algae (awaiting allocation)
- Phylum Algae incertae sedis
- Phylum Anthocerotophyta
- Phylum Bryophyta
- Phylum Calcitarcha †
- Phylum Charophyta
- Phylum Chlorophyta
- Phylum Eophyta †
- Phylum Glaucophyta
- Phylum Gymnospermophyta accepted as Tracheophyta
- Phylum Horneophyta †
- Phylum Magnoliophyta accepted as Tracheophyta
- Phylum Marchantiophyta
- Phylum Picozoa
- Phylum Plantae (awaiting allocation)
- Phylum Prasinodermatophyta
- Phylum Pteridophyta accepted as Tracheophyta
- Phylum Rhodelphidia
- Phylum Rhodophyta
- Subdivision Cyanidiophytina
- Subdivision Eurhodophytina
- Class Bangiophyceae
- Class Florideophyceae
- Order Acrochaetiales
- Order Acrosymphytales
- Order Ahnfeltiales
- Order Atractophorales
- Order Balbianiales
- Order Balliales
- Order Batrachospermales
- Order Bonnemaisoniales
- Order Catenellopsidales
- Order Ceramiales
- Family Callithamniaceae Kützing, 1843
- Family Ceramiaceae Dumortier, 1822
- Family Ceramiales incertae sedis
- Family Choreocolacaceae accepted as Rhodomelaceae J.E. Areschoug, 1847
- Family Dasyaceae Kützing, 1843 accepted as Delesseriaceae Bory, 1828
- Family Delesseriaceae Bory, 1828
- Genus Abroteia J.G. Agardh, 1876
- Genus Acrosorium Zanardini ex Kützing, 1869
- Genus Aeglophyllum Kützing, 1843
- Genus Agarum Link, 1809 accepted as Phycodrys Kützing, 1843
- Genus Aglaophyllum Montagne in A.D. d'Orbigny, 1839 accepted as Nitophyllum Greville, 1830
- Genus Amphisbetema Weber-van Bosse, 1913
- Genus Anisocladella Skottsberg, 1923
- Genus Apiarium Durant, 1850 accepted as Caloglossa (Harvey, 1853) G. Martens, 1869
- Genus Apoglossocolax Maggs & Hommersand, 1993
- Genus Apoglossum J.G. Agardh, 1898
- Genus Arachnophyllum Zanardini, 1843
- Genus Asperocaulon Greville, 1824 accepted as Heterosiphonia Montagne, 1842
- Genus Aspidophora Montagne in C. Gay, 1854 accepted as Cryptopleura Kützing, 1843
- Genus Asterocolax J. Feldmann & G. Feldmann, 1951
- Genus Augophyllum S.-M. Lin, S. Fredericq & M.H. Hommersand, 2004
- Genus Austrofolium M.J. Wynne, 1988
- Genus Baillouviana Adanson, 1763 accepted as Dasya C.A. Agardh, 1824
- Genus Bartoniella Kylin, 1924
- Genus Botryocarpa Greville, 1830
- Genus Botryoglossum Kützing, 1843
- Genus Branchioglossum Kylin, 1924
- Genus Calidictyon Greville in J. Lindley, 1836 accepted as Dictyurus Bory de Saint-Vincent, 1834
- Genus Calloseris J.G. Agardh, 1898
- Genus Caloglossa J.G. Agardh, 1876
- Genus Caloglossa (Harvey, 1853) G. Martens, 1869
- Genus Calonitophyllum C.C. Aregood, 1975
- Genus Capraella G. De Toni, 1936 accepted as Martensia K. Hering, 1841
- Genus Chauvinia Bory de Saint-Vincent, 1828 accepted as Caulerpa J.V.F. Lamouroux, 1809
- Genus Chauviniella Papenfuss, 1956
- Genus Chondrophyllum Kylin, 1924
- Genus Cladodonta Skottsberg, 1923
- Genus Claudea J.V.F. Lamouroux, 1813
- Genus Coelodictyon Kützing, 1845
- Genus Colacodasya F. Schmitz, 1897
- Genus Congregatocarpus Mikami, 1971
- Genus Conimophyllum accepted as Gonimophyllum Batters, 1892
- Genus Cottoniella Børgesen, 1919
- Genus Crassilingua Papenfuss, 1956
- Genus Cryptopleura Kützing, 1843
- Genus Cumathamnion M.J. Wynne & K. Daniels, 1966
- Genus Dasia C.A. Agardh, 1824
- Genus Dasya C.A. Agardh, 1824
- Genus Dasyella Falkenberg, 1901
- Genus Dasyopsis (C. Montagne) C. Montagne in A.C.V.D. d'Orbigny, 1847 accepted as Eupogodon Kützing, 1845
- Genus Dasysiphonia I.K. Lee & J.A. West, 1980
- Genus Dawsonia Palisot de Beauvois ex J.V.F. Lamouroux in Bory de St. Vincent, 1824 accepted as Cryptopleura Kützing, 1843
- Genus Delesseria J.V.F. Lamouroux, 1813
- Genus Dicroglossum A.J.K. Millar & J.M. Huisman, 1996
- Genus Dictyurus Bory de Saint-Vincent, 1834
- Genus Dipterocladia Y.S.D.M. de Jong in de Jong, Prud'homme van Reine & Lokhorst, 1997
- Genus Dotyella Womersley & Shepley, 1959
- Genus Drachiella J. Ernst & J. Feldmann, 1957
- Genus Duckerella M.J. Wynne, 1982
- Genus Ellisius S.F. Gray, 1821 accepted as Heterosiphonia Montagne, 1842
- Genus Endogenia J.G. Agardh, 1897
- Genus Erythroglossum J.G. Agardh, 1898
- Genus Eupogodon Kützing, 1845
- Genus Eupogonium Kützing, 1843 accepted as Dasya C.A. Agardh, 1824
- Genus Flabellina O.N. Selivanova & G.G. Zhigadalova, 2016 accepted as Phycoflabellina M.J. Wynne & C.W. Schneider, 2017
- Genus Frikkiella M.J. Wynne & C.W. Schneider, 1996
- Genus Glossopteris J.G. Agardh, 1898 accepted as Cladodonta Skottsberg, 1923
- Genus Gonimocolax Kylin, 1924
- Genus Gonimophyllum Batters, 1892
- Genus Grinnellia Harvey, 1853
- Genus Halicnide J.G. Agardh, 1898
- Genus Halydictyon Zanardini, 1843
- Genus Hanowia Sonder, 1845
- Genus Haraldia J. Feldmann, 1939
- Genus Haraldiophyllum A.D. Zinova, 1981
- Genus Hemineura Harvey, 1849
- Genus Hemitrema R. Brown ex Endlicher, 1843 accepted as Martensia K. Hering, 1841
- Genus Heterodoxia J.G. Agardh, 1898
- Genus Heteroglossum A.D. Zinova, 1972
- Genus Heteronema Kylin, 1924 accepted as Nienburgia Kylin, 1935
- Genus Heterosiphonia Montagne, 1842
- Genus Hideophyllum A.D. Zinova, 1981
- Genus Holmesia J.G. Agardh, 1890
- Genus Hydrolapatha Stackhouse, 1809
- Genus Hydrolapathum accepted as Delesseria J.V.F. Lamouroux, 1813
- Genus Hydrophylla Stackhouse, 1816
- Genus Hymenena Greville, 1830
- Genus Hymenenopsis S.-M. Lin, W.A. Nelson & M.H. Hommersand, 2012
- Genus Hymenophylla Stackhouse, 1816
- Genus Hypoglossum Kützing, 1843
- Genus Hypophylla Stackhouse, 1816
- Genus Hypophyllum Kylin, 1924 accepted as Neohypophyllum M.J. Wynne, 1983
- Genus Implicaria Heydrich, 1902
- Genus Kurogia Yoshida, 1979
- Genus Laingia Kylin, 1929
- Species Laingia aleutica M.J. Wynne, 1970
- Species Laingia hookeri (Lyall ex Harvey) Kylin, 1929
- Species Laingia pacifica (Yamada) Yamada, 1932 accepted as Congregatocarpus pacificus (Yamada) Mikami, 1971
- Genus Lamourouxia C.A. Agardh, 1817 accepted as Claudea J.V.F. Lamouroux, 1813
- Genus Loranthophycus E.Y. Dawson, 1944
- Genus Malaconema Womersley & Shepley, 1959
- Genus Marionella F.S. Wagner, 1954
- Genus Martensia K. Hering, 1841
- Genus Maugeria S.O. Gray, 1867
- Genus Membranoptera Stackhouse, 1809
- Genus Merenia Reinsch, 1888 accepted as Heterosiphonia Montagne, 1842
- Genus Mesotrema J.G. Agardh, 1854 accepted as Martensia K. Hering, 1841
- Genus Microrhinus Skottsberg, 1923
- Genus Mikamiella M.J. Wynne, 1977
- Genus Myriogramme Kylin, 1924
- Genus Nancythalia A.J.K. Millar & W.A. Nelson, 2002
- Genus Nematophora J.G. Agardh, 1890
- Genus Neoharaldiophyllum J.C. Kang & M.S. Kim in Kang et al., 2017
- Genus Neoholmesia Mikami, 1972
- Genus Neohypophyllum M.J. Wynne, 1983
- Genus Neomartensia Yoshida & Mikami, 1996 accepted as Martensia K. Hering, 1841
- Genus Neuroglossum Kützing, 1843
- Genus Nienburgella Perestenko, 1994 accepted as Phycodrys Kützing, 1843
- Genus Nienburgia Kylin, 1935
- Genus Nitophyllum Greville, 1830
- Genus Nitospinosa Womersley, 2003
- Genus Odontolaingia Mendoza, 1976
- Genus Okamurina A.D. Zinova, 1972
- Genus Okamurina A.D. Zinova, 1976
- Genus Oneillia C.A. Agardh, 1822 accepted as Claudea J.V.F. Lamouroux, 1813
- Genus Opephyllum F. Schmitz, 1897
- Genus Pachyglossum J.G. Agardh, 1894 accepted as Crassilingua Papenfuss, 1956
- Genus Pantoneura Kylin, 1919
- Genus Papenfussia Kylin, 1938
- Genus Papyracea Stackhouse, 1809 accepted as Cryptopleura Kützing, 1843
- Genus Paraglossum J.G. Agardh, 1898 accepted as Delesseria J.V.F. Lamouroux, 1813
- Genus Patulophycus A.J.K. Millar & M.J. Wynne, 1992
- Genus Phitycolax M.J. Wynne & F.J. Scott, 1989
- Genus Phitymophora J.G. Agardh, 1898
- Genus Phrix J.G. Stewart, 1974
- Genus Phycodrina M.J. Wynne, 1985
- Genus Phycodrys Kützing, 1843
- Genus Phycoflabellina M.J. Wynne & C.W. Schneider, 2017
- Genus Platyclina
- Genus Platyclinia J.G. Agardh, 1898
- Genus Platysiphonia Børgesen, 1931
- Genus Pogonophora J.G. Agardh, 1890 accepted as Dasya C.A. Agardh, 1824
- Genus Pogonophorella P.C. Silva, 1952 accepted as Dasya C.A. Agardh, 1824
- Genus Polycoryne Skottsberg, 1919
- Genus Polyneura (J.G. Agardh) Kylin, 1924
- Genus Polyneurella E.Y. Dawson, 1944
- Genus Polyneuropsis M.J. Wynne, D.L. McBride & J.A. West, 1973
- Genus Psammophyllum P.C. Silva & R.L. Moe, 1979 accepted as Erythroglossum J.G. Agardh, 1898
- Genus Pseudobranchioglossum M. Bodard, 1971
- Genus Pseudogrinnellia M.J. Wynne, 1999
- Genus Pseudolaingia Levring, 1944
- Genus Pseudonitophylla M.L. Mendoza, 1975
- Genus Pseudophycodrys Skottsberg, 1923
- Genus Pseudopolyneura K.W. Nam & P.J. Kang, 2012
- Genus Pteridium (Kützing, 1843) J.G. Agardh, 1898 accepted as Membranoptera Stackhouse, 1809
- Genus Radicilingua Papenfuss, 1956
- Genus Rhizoglossum Kylin, 1924 accepted as Radicilingua Papenfuss, 1956
- Genus Rhizophyllum Reinsch, 1875
- Genus Rhodokrambe R.L. Moe in Hommersand, Moe, Amsler & Fredericq, 2009
- Genus Rhodonema G. Martens, 1824 accepted as Dasya C.A. Agardh, 1824
- Genus Rhodoptilum J.G. Agardh, 1956
- Genus Rhodoseris Harvey, 1863 accepted as Botryoglossum Kützing, 1843
- Genus Robea Womersley, 2003
- Genus Ruprechtiella Kylin, 1924 accepted as Yendonia Kylin, 1935
- Genus Sachalinella A.D. Zinova, 1972 accepted as Neoholmesia Mikami, 1972
- Genus Saghalinella
- Genus Sarcomenia Sonder, 1845
- Genus Sarcotrichia Womersley & Shepley, 1959
- Genus Schizoglossum Kützing, 1843
- Genus Schizoneura J.G. Agardh, 1898
- Genus Schizoneurina A.B. Doweld, 2003 accepted as Erythroglossum J.G. Agardh, 1898
- Genus Schizoseris Kylin, 1924
- Genus Scutarius Roussel, 1806 accepted as Nitophyllum Greville, 1830
- Genus Searlesia C.W. Schneider & N.J. Eiseman, 1979 accepted as Polyneura (J.G. Agardh) Kylin, 1924
- Genus Sinosiphonia C.K. Tseng & B.L. Zheng, 1983
- Genus Sonderia F. von Müller in J.G. Agardh, 1890 accepted as Vanvoorstia Harvey, 1854
- Genus Sorella Hollenberg, 1943
- Genus Sorellocolax Yoshida & Mikami, 1996
- Genus Sterphalia B.C. Dumortier, 1822
- Genus Stichocarpus C.A. Agardh, 1827
- Genus Sympodophyllum Shepley & Womersley, 1960
- Genus Taenioma J.G. Agardh, 1863
- Genus Tapeinodasya Weber-van Bosse, 1904
- Genus Thuretia Decaisne, 1844
- Genus Tokidadendron M.J. Wynne, 1970
- Genus Trichothamnion Kützing, 1843
- Genus Tsengiella J.F. Zhang & B.M. Xia, 1987
- Genus Valeriemaya A.J.K. Millar & M.J. Wynne, 1992
- Genus Vanvoorstia Harvey, 1854
- Genus Vinassaella G. De Toni, 1936 accepted as Chauviniella Papenfuss, 1956
- Genus Womersleya Papenfuss, 1956
- Genus Wormskioldia Sprengel, 1827 accepted as Delesseria J.V.F. Lamouroux, 1813
- Genus Wormskjoldia
- Genus Wynneophycus S.Y. Jeong, B.Y. Won, S. Fredericq & T.O. Cho, 2016
- Genus Yamadaphycus Mikami, 1973
- Genus Yendonia Kylin, 1935
- Genus Yoshidaphycus Mikami, 1992
- Genus Zellera G. Martens, 1866
- Genus Zinovaea M.J. Wynne, 1970
- Genus Zygoselmis Dujardin, 1841
- Family Rhodomelaceae J.E. Areschoug, 1847
- Family Sarcomeniaceae Womersley, 2003 accepted as Delesseriaceae Bory, 1828
- Family Spyridiaceae accepted as Callithamniaceae Kützing, 1843
- Family Wrangeliaceae J.G. Agardh, 1851
- Order Colaconematales
- Order Corallinales
- Order Corynodactylales
- Order Cryptonemiales accepted as Halymeniales
- Order Entwisleiales
- Order Florideophyceae (awaiting allocation)
- Order Gelidiales
- Order Gigartinales
- Order Gracilariales
- Order Halymeniales
- Order Hapalidiales
- Order Hildenbrandiales
- Order Inkyuleeales
- Order Nemaliales
- Order Nemastomatales
- Order Palmariales
- Order Peyssonneliales
- Order Pihiellales
- Order Plocamiales
- Order Rhodachlyales
- Order Rhodogorgonales
- Order Rhodymeniales
- Order Sebdeniales
- Order Sporolithales
- Order Thoreales
- Family Pterocladiophilaceae Fan & Papenfuss, 1959
- Genus Corallinapetra T.J. Farr, W.A. Nelson & J.E. Sutherland in Nelson et al., 2015
- Genus Entocolax P.F. Reinsch, 1875
- Genus Gremiphyca Y. Zhang, L. Yin, S. Xiao & A.H. Knoll, 1998 †
- Genus Herpophyllum J.G. Agardh, 1894
- Genus Lobocolax M.A. Howe, 1914
- Genus Qingjiangthallus R. Li & X. Zhang, 2022 †
- Genus Ramathallus T. Sallstedt in Bengtson et al., 2017 †
- Genus Thallophycoides Y. Zhang & X.-L. Yuan, 1992 †
- Genus Corticina Y. Zhang & X.-L. Yuan, 1992 † accepted as Thallophycoides Y. Zhang & X.-L. Yuan, 1992 †
- Genus Wengania Y. Zhang, 1989 †
- Subdivision Metarhodophytina
- Subdivision Rhodellophytina
- Class Rhodophyceae accepted as Rhodophyta
- Order Archaeolithophyllales †
- Order Rhodophyta (awaiting allocation)
- Family Demidellaceae †
- Family Dzhulfanellaceae † accepted as Gymnocodiaceae Elliot, 1955 †
- Family Gymnocodiaceae Elliot, 1955 †
- Family Katavellaceae †
- Family Moniliporellaceae Gnilovskaya, 1972 †
- Genus Desmia J.G. Agardh, 1852
- Genus Xiahuayuania L.-Z. Bian, S.-C. Zhang, B.-M. Zhang & D.-R. Wang, 2005 †
- Phylum Sporae dispersae †
- Phylum Tracheophyta
- Phylum Vendophyta † accepted as Algae incertae sedis
- Class Nematophyceae † accepted as Nematophyta †
- Kingdom Protista accepted as Protozoa
- Kingdom Protozoa
- Kingdom Viruses
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