Between brackets is the number of accepted species
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2 Shows the number of accepted species within the taxon
3 The last expanded taxon is highlighted
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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
- Order Colaconematales
- Order Corallinales
- Family Archaeolithophyllaceae Chuvashov, 1987 †
- Family Corallinaceae Lamouroux, 1816
- Family Corallinales (awaiting allocation)
- Family Hydrolithaceae (A. Kato & M. Baba) R.A. Townsend & J.M. Huisman, 2018
- Genus Adeylithon V. Peña, L. Le Gall & J.C. Braga in Peña et al., 2018
- Genus Fosliella M.A. Howe in N.L. Britton & C. Millspaugh, 1920
- Species Fosliella affinis (Foslie) Taylor, 1960
- Species Fosliella ascripticia (Foslie) G.M. Smith, 1944 accepted as Titanoderma pustulatum (J.V. Lamouroux) Nägeli, 1858
- Species Fosliella atlantica (Foslie) Taylor, 1960
- Species Fosliella bermudensis (Foslie) W.R. Taylor, 1960
- Species Fosliella borealis (Foslie) Athanasiadis, 1996 accepted as Hydrolithon boreale (Foslie) Y.M. Chamberlain, 1994
- Species Fosliella chamadoris (Foslie & M.A. Howe) M.A. Howe, 1920
- Species Fosliella chamaedoris (Foslie & M.A. Howe) M.A. Howe, 1920
- Species Fosliella cruciata Bressan, 1977 accepted as Hydrolithon cruciatum (Bressan) Y.M. Chamberlain, 1994
- Species Fosliella cymodoceae (Foslie) P.L. Jones & Woelkerling, 1984 accepted as Hydrolithon cymodoceae (Foslie) Penrose, 1992
- Species Fosliella dispar (Foslie) G.M. Smith, 1944 accepted as Lithophyllum dispar (Foslie) Foslie, 1909
- Species Fosliella farinosa (J.V. Lamouroux) M.A. Howe, 1920 accepted as Hydrolithon farinosum (J.V. Lamouroux) D. Penrose & Y.M. Chamberlain, 1993
- Species Fosliella fertilis (M. Lemoine) Segonzac, 1984
- Species Fosliella intermedia (Foslie) G.M. Smith, 1944 accepted as Titanoderma pustulatum (J.V. Lamouroux) Nägeli, 1858
- Species Fosliella lejolisii (Rosanoff) M.A. Howe, 1920 accepted as Pneophyllum fragile Kützing, 1843
- Species Fosliella limitata (Foslie) Ganesan, 1963 accepted as Pneophyllum limitatum (Foslie) Y.M. Chamberlain, 1983
- Species Fosliella mediterranea Feldmann, 1939
- Species Fosliella minuta W.R. Taylor, 1945
- Species Fosliella minutula (Foslie) Ganesan, 1964 accepted as Pneophyllum confervicolum (Kützing) Y.M. Chamberlain, 1983
- Species Fosliella nicholsii (Setchell & Mason) G.M. Smith, 1944 accepted as Pneophyllum nicholsii (Setchell & L.R. Mason) P.C. Silva & P.W. Gabrielson, 2004
- Species Fosliella paschalis (M. Lemoine) Setchell & N.L. Gardner, 1930
- Species Fosliella sargassi (Foslie) Athanasiadis, 1996 accepted as Hydrolithon sargassi (Foslie) Y.M. Chamberlain, 1994
- Species Fosliella tenuis Adey & P.J. Adey, 1973 accepted as Pneophyllum coronatum (Rosanoff) Penrose, 1994
- Species Fosliella valida Adey & P.J. Adey, 1973
- Species Fosliella zonalis (P.L. Crouan & H.M. Crouan) Feldmann, 1939 accepted as Pneophyllum zonale (P.L. Crouan & H.M. Crouan) Y.M. Chamberlain, 1983
- Species Fosliella zostericola (Foslie) Segawa, 1976 accepted as Pneophyllum zostericola (Foslie) N.G. Kloczcova, 1987
- Genus Hydrolithon (Foslie) Foslie, 1909
- Genus Melobesia Foslie, 1898 accepted as Hydrolithon (Foslie) Foslie, 1909
- Family Lithophyllaceae (Setchell, 1943) A. Athanasiadis, 2016
- Family Mastophoraceae (Setchell, 1943) R.A. Townsend & J.M. Huisman, 2018
- Family Mesophyllaceae A. Athanasiadis, 2016 accepted as Mesophyllumaceae C.W. Schneider & M.J. Wynne, 2019
- Family Porolithaceae R.A. Townsend & J.M. Huisman, 2018
- Family Solenoporaceae Pia, 1920 † accepted as Corallinales (awaiting allocation)
- Family Spongitaceae Kützing, 1843
- Genus Amphithallia A. Athanasiadis, 2019
- Genus Halysis O.A. Høeg, 1932 †
- Genus Paramecia Y. Zhang & X.-L. Yuan, 1992 †
- Genus Phormidiodea Wieland, 1930 †
- Genus Thallophyca Y. Zhang, 1989 †
- 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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