Between brackets is the number of accepted species
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2 Shows the number of accepted species within the taxon
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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
- Order Corynodactylales
- Order Cryptonemiales accepted as Halymeniales
- Order Entwisleiales
- Order Florideophyceae (awaiting allocation)
- Order Gelidiales
- Order Gigartinales
- Family Acrotylaceae Schmitz, 1892
- Family Areschougiaceae J.G. Agardh, 1876
- Family Blinksiaceae Hollenberg & Abbott, 1968
- Family Calosiphoniaceae Kylin, 1932
- Family Caulacanthaceae Kützing, 1843
- Family Chondriellaceae Levring, 1941
- Family Chondrymeniaceae C. Rodriguez-Prieto, G. Sartoni, S.-M. Lin & M.H. Hommersand, 2013
- Family Corynocystaceae G.T. Kraft in Saunders et al., 2004
- Family Crossocarpaceae Perestenko, 1975
- Family Cruoriaceae (J.G. Agardh) Kylin, 1928
- Family Cubiculosporaceae Kraft, 1973
- Family Cystocloniaceae Kützing, 1843
- Family Dicranemaceae accepted as Dicranemataceae Kylin, 1932
- Family Dicranemataceae Kylin, 1932
- Family Dilseaceae accepted as Dumontiaceae Bory, 1828
- Family Dumontiaceae Bory, 1828
- Family Endocladiaceae Kylin, 1928
- Family Etheliaceae K.R. Dixon, C.W. Schneider & G.W. Saunders in Dixon et al., 2015
- Family Furcellariaceae Kylin, 1932
- Family Gainiaceae R.L. Moe, 1985
- Family Gigartinaceae Kützing, 1843
- Family Gigartinales (awaiting allocation)
- Family Gloiosiphoniaceae F. Schmitz in Engler, 1892
- Family Gymnophlaeaceae accepted as Nemastomataceae Schmitz, 1892
- Family Haemeschariaceae R.T. Wilce & C.A. Maggs
- Family Hypneaceae J.G. Agardh, 1851 accepted as Cystocloniaceae Kützing, 1843
- Family Kallymeniaceae (J.G. Agardh) Kylin, 1928
- Family Mychodeaceae Kylin, 1932
- Family Mychodeophyllaceae Kraft, 1978
- Family Nizymeniaceae Womersley, 1971
- Family Petrocelidaceae accepted as Phyllophoraceae Nägeli, 1847
- Family Phacelocarpaceae Searles, 1968
- Family Phyllophoraceae Nägeli, 1847
- Family Placentophoraceae C. Rodríguez-Prieto, G. Sartoni, S.- M. Lin & M.H. Hommersand, 2013 ex R.V. Dumilag, W.A. Nelson & G.T. Kraft, 2019
- Genus Callophycus Trevisan, 1848
- Genus Mammea J.G. Agardh, 1841 accepted as Callophycus Trevisan, 1848
- Genus Placentophora Kraft, 1976
- Species Placentophora colensoi (J.D. Hooker & Harvey) Kraft, 1976
- Genus Thysanocladia Endlicher, 1843 accepted as Callophycus Trevisan, 1848
- Family Polyidaceae Kylin, 1956
- Family Polyideaceae accepted as Polyidaceae Kylin, 1956
- Family Ptilocladiopsidaceae C. Rodriguez-Prieto, D.W. Freshwater & M.H. Hommersand, 2014
- Family Rhabdoniaceae accepted as Areschougiaceae J.G. Agardh, 1876
- Family Rhizophyllidaceae Schmitz, 1889
- Family Rhodophyllidaceae accepted as Cystocloniaceae Kützing, 1843
- Family Rissoellaceae Kylin, 1932
- Family Schmiziellaceae M.D. Guiry, D.J. Garbary & G.W. Saunders in Guiry, 2012
- Family Solieriaceae J.G. Agardh, 1876
- Family Sphaerococcaceae Schmitz & Hauptfleisch
- Family Stictosporaceae accepted as Cystocloniaceae Kützing, 1843
- Family Tichocarpaceae Kylin, 1932
- Family Weeksiaceae accepted as Dumontiaceae Bory, 1828
- Family Wurdemanniaceae accepted as Solieriaceae J.G. Agardh, 1876
- 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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