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
- Family Rhodomelaceae J.E. Areschoug, 1847
- Genus Abbottella Hollenberg, 1967
- Genus Acanthochondria Weber-van Bosse, 1910
- Genus Acanthophora J.V.F. Lamouroux, 1813
- Genus Acanthosiphonia A.M. Savoie & G.W. Saunders, 2019
- Genus Acrocystis Zanardini, 1872
- Genus Adamsiella L.E. Phillips & W.A. Nelson in L.E. Phillips, 2002
- Genus Aiolocolax M.A. Pocock, 1956
- Genus Alleynea Womersley, 2003
- Genus Alsidium C.A. Agardh, 1827
- Genus Amansia J.V.F. Lamouroux, 1809
- Genus Amphibia Stackhouse, 1809 accepted as Bostrychia Montagne in Sagra, 1842
- Genus Amplisiphonia Hollenberg, 1939
- Genus Aneuria (J.G. Agardh) Weber-van Bosse, 1911 accepted as Lenormandiopsis Papenfuss, 1967
- Genus Aneurianna L.E. Phillips, 2006
- Genus Antarctocolax Skottsberg, 1953
- Genus Aphanarthron J.G. Agardh, 1868 accepted as Rhodomela C.A. Agardh, 1822
- Genus Aphanocladia Falkenberg in Engler & Prantl, 1897
- Genus Ardissonula G. De Toni, 1936
- Genus Areschougia Trevisan, 1845
- Genus Atomaria Stackhouse, 1816 accepted as Odonthalia Lyngbye, 1819
- Genus Benzaitenia Yendo, 1913
- Genus Beringiella M.J. Wynne, 1980
- Genus Boergeseniella Kylin, 1956
- Genus Bolboclinium J.G. Agardh, 1894 accepted as Chondria C.A. Agardh, 1817
- Genus Bostrychia Montagne in Sagra, 1842
- Genus Bostrychiocolax G.C. Zuccarello & J.A. West, 1994
- Genus Bosworthia C.D. Walcott, 1919 †
- Genus Brongniartella Bory de Saint-Vincent, 1822
- Genus Bryocladia F. Schmitz, 1897
- Genus Bryothamnion Kützing, 1843 accepted as Alsidium C.A. Agardh, 1827
- Genus Calocopsis accepted as Colacopsis De Toni, 1903
- Genus Carpocaulon Kützing, 1843
- Genus Carradoria Martius, 1833 accepted as Polysiphonia Greville, 1823
- Genus Carradoria Kylin, 1956 accepted as Carradoriella P.C. Silva, 1996
- Genus Carradoriella P.C. Silva, 1996
- Genus Chamaethamnion Falkenberg in Engler & Prantl, 1897
- Genus Chiracanthia Falkenberg in Engler & Prantl, 1897
- Genus Chondria C.A. Agardh, 1817
- Genus Chondriopsis J.G. Agardh, 1863 accepted as Chondria C.A. Agardh, 1817
- Genus Chondrophycus (J. Tokida & Y. Saito) D.J. Garbary & J.T. Harper, 1998
- Genus Choreocolax Reinsch, 1875
- Genus Cladhymenia Harvey, 1845
- Genus Cladurus Falkenberg in Engler & Prantl, 1897
- Genus Cliftonaea (Harvey) Harvey, 1863
- Genus Cliftonia Harvey, 1859 accepted as Cliftonaea (Harvey) Harvey, 1863
- Genus Coeloclonium J.G. Agardh, 1876
- Genus Colaconema K.J.F. Schmitz in Engler & Prantl, 1897
- Genus Colacopsis De Toni, 1903
- Genus Coronaphycus Y. Metti in Metti et al., 2015 accepted as Corynecladia J.G. Agardh, 1876
- Genus Corynecladia J.G. Agardh, 1876
- Genus Ctenosiphonia Falkenberg in Engler & Prantl, 1897
- Genus Dalyia C.D. Walcott, 1919 †
- Genus Dasyclonia J.E. Gray, 1864
- Genus Dasyclonium J.G. Agardh, 1894
- Genus Dasyphylla Stackhouse, 1816
- Genus Dasythamnion P.[J.L.] Dangeard, 1953
- Genus Dawsoniella A.B. Joly & Yamaguishi-Tomita, 1967 accepted as Dawsoniocolax A.B. Joly & Yamaguishi-Tomita, 1970
- Genus Dawsoniella Hollenberg, 1967
- Genus Dawsoniocolax A.B. Joly & Yamaguishi-Tomita, 1970
- Genus Dicarpella Bory de Saint-Vincent, 1823 accepted as Polysiphonia Greville, 1823
- Genus Dictyomenia Greville, 1830
- Genus Digenea C.A. Agardh, 1822
- Genus Digeneopsis Simons, 1970
- Genus Digenia accepted as Digenea C.A. Agardh, 1822
- Genus Digereopsis accepted as Digeneopsis Simons, 1970
- Genus Diplocladia Kylin, 1956
- Genus Dipterocolax J. Morrill, 1977
- Genus Dipterosiphonia K.J.F. Schmitz & Falkenberg in Engler & Prantl, 1897
- Genus Ditria Hollenberg, 1967
- Genus Dolichoscelis J.G. Agardh, 1897
- Genus Doxodasya (F. Schmitz) P. Falkenberg, 1901
- Genus Echinophycus Huisman, 2001
- Genus Echinosporangium Kylin, 1956
- Genus Echinothamnion Kylin, 1956
- Species Echinothamnion hookeri (Harvey) Kylin ex P.C. Silva, 1996
- Species Echinothamnion hystrix (J.D. Hooker & Harvey) Kylin, 1956
- Species Echinothamnion lyallii (J.D. Hooker & Harvey) Kylin ex P.C. Silva, 1996
- Species Echinothamnion mallardiae (Harvey) Kylin ex P.C. Silva, 1996
- Genus Enantiocladia Falkenberg in Engler & Prantl, 1897
- Genus Endosiphonia Zanardini, 1878
- Genus Enelittosiphonia Segi, 1949
- Genus Epiglossum Kützing, 1849
- Genus Epineuron Harvey, 1845 accepted as Osmundaria J.V.F. Lamouroux, 1813
- Genus Epizonaria P. Díaz-Tapia & C.A. Maggs in Díaz-Tapia et al., 2017
- Genus Erythrocystis J.G. Agardh, 1876
- Genus Erythrostachys J.G. Agardh ex J. White, 1911
- Genus Euspiros G. Targioni-Tozzetti ex F.J. Ruprecht, 1849
- Genus Euspiros Targioni Tozzetti ex O. Kuntze, 1891
- Genus Eutrichosiphonia A.M. Savoie & G.W. Saunders, 2018
- Genus Euzonia Kylin, 1956 accepted as Dasyclonium J.G. Agardh, 1894
- Genus Euzoniella Falkenberg, 1901 accepted as Dasyclonium J.G. Agardh, 1894
- Genus Exophyllum Weber-van Bosse, 1911
- Genus Falkenbergiella Kylin, 1938 accepted as Lophosiphonia Falkenberg in Engler & Prantl, 1897
- Genus Fernandosiphonia Levring in Skottsberg, 1941
- Genus Fimbriaria Stackhouse, 1809
- Genus Fuscaria Stackhouse, 1809 accepted as Rhodomela C.A. Agardh, 1822
- Genus Girodia T.G. Lestiboudois, 1827
- Genus Gonatogenia J.G. Agardh, 1896
- Genus Grammalia B.C. Dumoriter, 1829
- Genus Grammita T. Bonnemaison, 1822
- Genus Grammitella P. Crouan & H. Crouan, 1848
- Genus Grateloupella Bory de St.-Vincent, 1823 accepted as Polysiphonia Greville, 1823
- Genus Gratelupella Bory de St.-Vincent, 1823 accepted as Polysiphonia Greville, 1823
- Genus Gredgaria Womersley, 2003
- Genus Halopithys Kützing, 1843
- Genus Haplodasya Falkenberg in Engler & Prantl, 1897
- Genus Harveyella F. Schmitz & Reinke, 1889
- Genus Hawaiia Hollenberg, 1967
- Genus Helicothamnion Kützing, 1843
- Genus Helicothamnium F.T. Kützing, 1841
- Genus Helminthochorton Zanardini, 1843
- Genus Helminthochortos Link, 1833
- Genus Herpopteros Falkenberg in Engler & Prantl, 1897
- Genus Herposiphonia Nägeli, 1846
- Genus Herposiphoniella Womersley, 2003
- Genus Heterocladia Decaisne, 1841
- Genus Heterodasya Joly & de Oliveira Filho, 1966
- Genus Heterostroma G.T. Kraft & M.J. Wynne, 1992
- Genus Holotrichia F. Schmitz, 1897
- Genus Husseya J.G. Agardh, 1901
- Genus Husseyella Papenfuss, 1958 accepted as Husseya J.G. Agardh, 1901
- Genus Hutchinsia C.A. Agardh, 1817
- Genus Isoptera Okamura, 1901
- Genus Janczewskia Solms-Laubach, 1877
- Genus Jantinella Kylin, 1941
- Genus Jeannerettia J.D. Hooker & W.H. Harvey in W.H. Harvey, 1847 accepted as Pollexfenia Harvey, 1844
- Genus Kapraunia A.M. Savoie & G.W. Saunders, 2018
- Genus Kentrophora S.M. Wilson & G.T. Kraft in R.J.F. Henderson, S.M. Wilson & G.T. Kraft, 2001
- Genus Kintarosiphonia S. Uwai & M. Masuda, 1999
- Genus Kuetzingia Sonder, 1845
- Genus Lampisiphonia H.-G. Choi, P. Diaz Tapia & I. Bárbara in Bárbara, Choi, Secilla, Díaz-Tapia, Gorostiaga, Seo, Jung & Berecibar, 2013
- Genus Laurencia J.V.F. Lamouroux, 1813
- Genus Laurenciella V. Cassano, M.C. Gil-Rodrüguez, A. Sentües, J. Düaz-Larrea, M.C. Oliveira & M.T. Fujii in Cassano, Oliveira, Gil-Rodríguez, Sentíes, Díaz-Larrea & Fujii, 2012
- Genus Laurenciocolax A.D. Zinova & L.P. Perestenko, 1964
- Genus Leachiella Kugrens, 1982
- Genus Lembergia Saenger, 1971
- Genus Lenormandia Sonder, 1845
- Genus Lenormandiopsis Papenfuss, 1967 accepted as Lenormandia Sonder, 1845
- Genus Leptosiphonia Kylin, 1956
- Genus Leveillea Decaisne, 1839
- Genus Leveillia W.H. Harvey, 1849
- Genus Levringiella Kylin, 1956
- Genus Lophocladia F. Schmitz, 1893
- Genus Lophocladiae accepted as Lophocladia F. Schmitz, 1893
- Genus Lophosiphonia Falkenberg in Engler & Prantl, 1897
- Genus Lophothalia Kützing, 1849
- Genus Lophura Kützing, 1843
- Genus Lophurella F. Schmitz, 1897
- Genus Lynkiella R.P. Varma, 1960 accepted as Veleroa E.Y. Dawson, 1944
- Genus Maschalostroma F. Schmitz, 1897 accepted as Gonatogenia J.G. Agardh, 1896
- Genus Melanamansia R.E. Norris, 1988
- Genus Melanocolax M.T. Martin & Pocock, 1953 accepted as Colacopsis De Toni, 1903
- Genus Melanoseris Zanardini, 1874 accepted as Pollexfenia Harvey, 1844
- Genus Melanothamnus Bornet & Falkenberg in Falkenberg, 1901
- Genus Meridiocolax J. Morrill, 1976
- Genus Metamorphe Falkenberg in Engler & Prantl, 1897
- Genus Micramansia Kützing, 1865
- Genus Microcolax F. Schmitz, 1897
- Genus Micropeuce J.G. Agardh, 1899
- Genus Murrayella F. Schmitz, 1893
- Genus Murrayellopsis E. Post, 1963 accepted as Veleroa E.Y. Dawson, 1944
- Genus Nanopera S.M. Wilson & G.T. Kraft, 2000
- Genus Neochondria S. Sutti, M. Tani, Y. Yamagishi, T. Abe & K. Kogame in Sutti et al., 2018
- Genus Neorhodomela Masuda, 1982
- Genus Neosiphonia M.-S. Kim & I.K. Lee, 1999
- Genus Neotenophycus G.T. Kraft & I.A. Abbott, 2002
- Genus Neurymenia J.G. Agardh, 1863
- Genus Odonthalia Lyngbye, 1819
- Genus Ohelopapa F. Rousseau, J. Martin-Lescanne, C. Payri & L. Le Gall in Rousseau et al., 2017
- Genus Oligocladella P.C. Silva, 1996
- Genus Oligocladus Weber-van Bosse, 1911 accepted as Oligocladella P.C. Silva, 1996
- Genus Oligosiphonia J.E. Gray, 1864
- Genus Onychocolax M.A. Pocock, 1956
- Genus Ophidocladus Falkenberg in Engler & Prantl, 1897
- Genus Orcasia Kylin, 1941
- Genus Osmundaria J.V.F. Lamouroux, 1813
- Genus Osmundea Stackhouse, 1809
- Genus Pachychaeta Kützing, 1862
- Genus Palisada K.W. Nam, 2007
- Genus Palisadi accepted as Palisada K.W. Nam, 2007
- Genus Pallisada accepted as Palisada K.W. Nam, 2007
- Genus Pentocladia J.M. Huisman, 2018
- Genus Periphykon Weber-van Bosse, 1929
- Genus Perrinia Womersley, 2003
- Genus Phaeocolax Hollenberg, 1967
- Genus Phaeosiphonia Kützing, 1849 accepted as Hutchinsia C.A. Agardh, 1817
- Genus Physcophora Kützing, 1843
- Genus Picconiella G. De Toni, 1936
- Genus Piconiella accepted as Picconiella G. De Toni, 1936
- Genus Pinnatifida Stackhouse, 1816
- Genus Pithyopsis Falkenberg in Engler & Prantl, 1897
- Genus Pityophykos Papenfuss, 1958
- Genus Placophora J.G. Agardh, 1863
- Genus Plectrophora S.M. Wilson & G.T. Kraft, 2000 accepted as Kentrophora S.M. Wilson & G.T. Kraft in R.J.F. Henderson, S.M. Wilson & G.T. Kraft, 2001
- Genus Pleurostichidium Heydrich, 1893
- Genus Pollexfenia Harvey, 1844
- Genus Polychetum Chevallier, 1836 accepted as Polysiphonia Greville, 1823
- Genus Polyochetum Chevallier, 1836
- Genus Polyostea Ruprecht, 1850 accepted as Polysiphonia Greville, 1823
- Genus Polyphacum C.A. Agardh, 1820 accepted as Osmundaria J.V.F. Lamouroux, 1813
- Genus Polysiphonia R.K. Greville, 1823 [2] accepted as Polysiphonia Greville, 1823
- Genus Polysiphonia Greville, 1823
- Genus Polyzonia Suhr, 1834
- Genus Protokuetzingia Falkenberg in Engler & Prantl, 1897
- Genus Pseudendosiphonia Weber-van Bosse, 1913 accepted as Endosiphonia Zanardini, 1878
- Genus Pseudoendosiphonia Weber-van Bosse, 1913
- Genus Pterochondria Hollenberg, 1942
- Genus Pteronia F. Schmitz, 1897 accepted as Picconiella G. De Toni, 1936
- Genus Pterosiphonia Falkenberg in Engler & Prantl, 1897
- Genus Pterosiphoniella E.Y. Dawson, 1963
- Genus Pycnothamnion P.J.L. Dangeard, 1953
- Genus Rhododactylis J.G. Agardh, 1876 accepted as Husseya J.G. Agardh, 1901
- Genus Rhodolachne M.J. Wynne, 1970
- Genus Rhodolophia Kylin, 1956 accepted as Erythrostachys J.G. Agardh ex J. White, 1911
- Genus Rhodomela C.A. Agardh, 1822
- Genus Rhodomelopsis Pocock, 1953
- Genus Rhodopeltis Askenasy, 1872
- Genus Rhodosiphonia Hollenberg, 1943 accepted as Ophidocladus Falkenberg in Engler & Prantl, 1897
- Genus Ricardia Derbès & Solier, 1856 accepted as Erythrocystis J.G. Agardh, 1876
- Genus Rodriguezella F. Schmitz, 1895
- Genus Roschera Sonder in von der Decken, 1879 accepted as Tolypiocladia F. Schmitz, 1897
- Genus Rytiphlaea C.A. Agardh, 1817
- Genus Rytiphloea C.A. Agardh, 1817
- Genus Savoiea M.J. Wynne, 2018
- Genus Schizochlaenion M.J. Wynne & R.E. Norris, 1982
- Genus Scorpioides Roussel, 1806
- Genus Scorpiura Stackhouse, 1816
- Genus Sonderella F. Schmitz, 1897
- Genus Spirhymenia Decaisne, 1841
- Genus Spirocladia Børgesen, 1933
- Genus Spirophycus A.J.K. Millar, 2000
- Genus Sporoglossum Kylin, 1919
- Genus Stichothamnion Børgesen, 1930
- Genus Stictosiphonia J.D. Hooker & W.H. Harvey in J.D. Hooker, 1847
- Genus Streblocladia F. Schmitz, 1897
- Genus Stromatocarpus Falkenberg in Engler & Prantl, 1897
- Genus Symphiocladia accepted as Symphyocladia Falkenberg in Engler & Prantl, 1897
- Genus Symphyocladia Falkenberg in Engler & Prantl, 1897
- Genus Symphyocladiella D.E. Bustamante, B.Y. Won & T.O. Cho in Bustamante, Won, Lindstrom & Cho, 2019
- Genus Symphyocolax M.S. Kim in Kim & Cho, 2010
- Genus Tayloriella Kylin, 1938
- Genus Thaumatella (Falkenberg) Kylin, 1956 accepted as Veleroa E.Y. Dawson, 1944
- Genus Tiparraria Womersley, 2003
- Genus Tolypiocladia F. Schmitz, 1897
- Genus Trichidium J.M. Noble & G.T. Kraft, 1984
- Genus Trigenea Sonder, 1845
- Genus Tylocolax F. Schmitz, 1897
- Genus Ululania K.E. Apt & K.E. Schlech, 1998
- Genus Veleroa E.Y. Dawson, 1944
- Genus Vertebrata S.F. Gray, 1821
- Genus Vidalia J.V.F. Lamouroux ex J.G. Agardh, 1863
- Genus Volubilaria J.V.F. Lamouroux ex Bory de St.-Vincent, 1830 accepted as Osmundaria J.V.F. Lamouroux, 1813
- Genus Wahpia C.D. Walcott, 1919 †
- Genus Waldoia W.R. Taylor, 1962
- Genus Waputikia C.D. Walcott, 1919 †
- Genus Wilsonaea F. Schmitz, 1893
- Genus Wilsonosiphonia D.E. Bustamante, B.Y. Won & T.O. Cho in Bustamante et al., 2017
- Genus Womerleyella accepted as Womersleyella Hollenberg, 1967
- Genus Womersleyella Hollenberg, 1967
- Genus Wrightiella F. Schmitz, 1893
- Genus Xiphosiphonia A.M. Savoie & G.W. Saunders, 2016
- Genus Yuzurua (K.W. Nam, 1999) J. Martin-Lescanne in Martin-Lescanne et al., 2010
- 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
- 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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