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
- Class Charophyceae
- Order Charales
- Family Aclistocharaceae † accepted as Characeae Agardh, 1824
- Family Atopocharaceae R.E. Peck, 1938 † accepted as Clavatoraceae Pia, 1927 †
- Family Characeae Agardh, 1824
- Genus Acinaria Rafinesque, 1819 †
- Genus Aclistochara R.E. Peck, 1937 †
- Genus Acutochara L. Ya. Sajdakovskij, 1993 †
- Genus Amblyochara L. Grambast, 1963 †
- Genus Amphorochara L.K. Krasavina, 1978 †
- Genus Bechera Sternberg, 1825 † accepted as Gyrogonites J.B. de Lamarck ex J.B. de Lamarck, 1822 †
- Genus Brachychara L. Grambast & N. Grambast, 1954 †
- Genus Brevichara H. Horn af Rantzien, 1956 †
- Genus Caucasuella N.P. Kyansep-Romashkina, 1980 † accepted as Aclistochara R.E. Peck, 1937 †
- Genus Chara Linnaeus, 1753
- Genus Characeites J. Tuzson, 1914 †
- Genus Characella Gaillon, 1833
- Genus Characias C.S. Rafinesque, 1815
- Genus Charaxis T.M. Harris, 1939 †
- Genus Charella G. Stache, 1889
- Genus Charina N. Filarszky & G.O. Allen ex N. Filarszky, 1937 accepted as Nitella C.A. Agardh, 1824
- Genus Charites H. Horn af Rantzien, 1959 †
- Genus Charopsis Kützing, 1843 accepted as Chara Linnaeus, 1753
- Genus Circonitella J. Watson, 1969 †
- Genus Clavatoraxis C. Martín-Closas & C. Diéguez, 1998 †
- Genus Cristatella (G. Stache, 1889) Groves, 1933 †
- Genus Croftiella H. Horn af Rantzien, 1959 †
- Genus Dughiella M. Feist-Castel, 1975 †
- Genus Euaclistochara Wang, Huang & Wang, 1976 †
- Genus Gobichara J. Karczewska & M. Ziembinska-Tworzydlo, 1972 †
- Genus Grambastichara H. Horn af Rantzien, 1959 †
- Genus Grambastiella M. Massieux & Y. Tambareau, 1979 †
- Genus Grovesichara H. Horn af Rantzien, 1959 †
- Genus Gyrogona Lamarck ex Lamarck, 1822 † accepted as Gyrogonites J.B. de Lamarck ex J.B. de Lamarck, 1822 †
- Genus Gyrogonites J.B. de Lamarck ex J.B. de Lamarck, 1822 †
- Genus Harrisichara L. Grambast, 1957 †
- Genus Hornichara V.P. Maslov, 1963 †
- Genus Kosmogyra G. Stache, 1889 †
- Genus Kosmogyrella G. Stache, 1889 †
- Genus Kosmogyrina K. Mädler, 1952 †
- Genus Krassavinella M. Feist-Castel, 1977 †
- Genus Lagynophora G. Stache, 1880 †
- Genus Lamprothamnium J. Groves, 1916
- Genus Lamprothamnus A. Braun, 1882 accepted as Lamprothamnium J. Groves, 1916
- Genus Latochara K. Mädler, 1955 †
- Genus Leiacina C.S. Rafinesque, 1825
- Genus Lychnothamnites V.P. Maslov, 1966 †
- Genus Lychnothamnus (F.J. Ruprecht) A. Braun, 1857
- Genus Lysimoscepas W. Griffith, 1849
- Genus Macropogon Migula, 1897 †
- Genus Maedleriella L. Grambast, 1957 †
- Genus Maedlerisphaera H. Horn af Rantzien, 1959 †
- Genus Mesochara L. Grambast, 1963 †
- Genus Microchara L. Grambast, 1960 †
- Genus Mongolichara N.P. Kyansep-Romashkina in N.N. Kramarenko, 1975 †
- Genus Multispirochara Y.C. Hao in Y.C. Hao et al., 1983 †
- Genus Musacchiella Feist & Grambast-Fessard, 1984 †
- Genus Nemegtichara J. Karczewska & M. Ziembinska-Tworzydlo, 1972 †
- Genus Neochara Z. Wang, 1978 †
- Genus Nitella C.A. Agardh, 1824
- Genus Nitellites H. Horn af Rantzien, 1957 †
- Genus Nitellopsis Hy, 1889
- Species Nitellopsis aculeolata M. Soulat-Ribette, 1892 accepted as Nitellopsis obtusa (N.A. Desvaux) J. Groves, 1919
- Species Nitellopsis bulbillifera C. Carl de Donterberg, 1960
- Species Nitellopsis etrusca (Tongiorgi) L. Grambast & I. Soulié-Märsche, 1972
- Species Nitellopsis globula (Mädler) L. Grambast & I. Soulié-Märsche, 1972
- Species Nitellopsis helicteres (Brongniart) L. Grambast & I. Soulié-Märsche, 1973
- Species Nitellopsis helvetica (Mädler) L. Grambast & Soulié-Märsche, 1973
- Species Nitellopsis huangii (Lu) L. Grambast & Soulié-Mérsche, 1973
- Species Nitellopsis inflata N. Filarszky & G.O. Allen ex N. Filarszky, 1937 accepted as Chara corallina Klein ex C.L. Willdenow, 1805
- Species Nitellopsis ixtapensis (Daily & Durham) L. Grambast & Soulié-Märsche, 1973
- Species Nitellopsis meriani (A. Braun ex Unger) L. Grambast & Soulié-Märsche, 1973
- Species Nitellopsis morulosa (M. Feist-Castel) M. Feist & N. Grambast-Fessard, 1991
- Species Nitellopsis obtusa (N.A. Desvaux) J. Groves, 1919
- Species Nitellopsis ovalis (G.D. Yang) M. Feist & N. Grambast-Fessard, 1990
- Species Nitellopsis ovata Krassavina, 1967
- Species Nitellopsis palaeohungarica (Rásky) L. Grambast & I. Soulié-Märsche, 1973
- Species Nitellopsis sarcularis J.S. Zaneveld, 1940
- Species Nitellopsis stelligera (Bauer) Hy, 1890
- Species Nitellopsis supraplana (Peck & Reker) L. Grambast & Soulié-Märsche, 1973
- Species Nitellopsis thaleri (Castel & L. Grambast) L. Grambast & Soulié-Märsche, 1973
- Species Nitellopsis usboensis (Maslov) L. Grambast & Soulié-Märsche, 1972
- Genus Nodosochara K. Mädler, 1955 †
- Genus Obtusochara K. Mädler, 1952 †
- Genus Peckichara L. Grambast, 1957 †
- Genus Peckisphaera L. Grambast, 1963 †
- Genus Piriformachara J. Liu & X. Wu, 1985 †
- Genus Platychara L. Grambast, 1963 †
- Genus Protochara Womersley & Ophel, 1947 accepted as Chara Linnaeus, 1753
- Genus Psilochara L. Grambast, 1960 †
- Genus Qinghaichara G.D. Yang in Y.C. Hao et al., 1983 †
- Genus Raskyaechara H. Horn af Rantzien, 1959 †
- Genus Rhabdochara K. Mädler, 1955 †
- Genus Saidakovskyella I.M. Shaikin, 1976 †
- Genus Sphaerochara K. Mädler, 1952 †
- Genus Stephanochara L. Grambast, 1960 †
- Genus Tectochara L. Grambast & N. Grambast, 1954 †
- Genus Tolypella (A. Braun) A. Braun, 1857
- Genus Tolypellopsis (H. von Leonhardi) W. Migula, 1890 accepted as Nitellopsis Hy, 1889
- Genus Triclypella L. Grambast, 1969 †
- Genus Wangichara J. Liu & X. Wu, 1985 †
- Family Clavatoraceae Pia, 1927 †
- Family Eocharaceae Grambast, 1959 †
- Family Feistiellaceae Schudack, 1993 †
- Family Lagynophoraceae Stache, 1889 † accepted as Characeae Agardh, 1824
- Family Leonidiellaceae † accepted as Porocharaceae Grambast, 1962 †
- Family Palaeocharaceae Pia, 1927 †
- Family Porocharaceae Grambast, 1962 †
- Family Raskyellaceae Grambast, 1957 †
- Family Stellatocharaceae J.E. Conkin & B.M. Conkin, 1997 † accepted as Porocharaceae Grambast, 1962 †
- Genus Emsiella B. Mamet & A. Preat, 2013 †
- Order Charophyceae (awaiting allocation)
- Order Moellerinales †
- Order Sycidiales †
- Order Trochiliscales † accepted as Sycidiales †
- Order Umbellinales †
- Class Chlorokybophyceae
- Class Coleochaetophyceae
- Class Conjugatophyceae accepted as Zygnematophyceae
- Class Klebsormidiophyceae
- Class Mesostigmatophyceae
- Class Zygnematophyceae
- 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
- 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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