Ta
- Tabris Nakada, 2009
Tasmanites E.T.Newton, 1875
- Tasmanites marshalliae (M.Parke) G.T.Boalch & D.Guy-Ohlson, 1992 †
- Tasmanites pelagica (C.H.Ostenfeld) G.T.Boalch & D.Guy-Ohlson †
- Tasmanites vindhyanensis P.K.Maithy & M.Shukla †
Chlorophyta → Prasinophyceae → Pyramimonadales → Pyramimonadaceae
Te
- Tellamia Batters, 1895
- Telmatoskene Fott, 1957
- Temnogyra I.F.Lewis, 1925
- Terquemella
- Tethysicodium O.Dragastan, 1985
- Tetrabaena Fromentel
- Tetrabaenaceae H.Nozaki & M.Itoh
- Tetrablepharis Senn ex Wille, 1909
- Tetrachlorella Korshikov, 1939
- Tetraciella Pascher & Petrová, 1930
- Tetracladus Swirenko, 1927
- Tetracoccus West & J.Roy, 1892
- Tetracystaceae
- Tetracystis R.M.Brown, Jr & Bold, 1964
- Tetradesmus G.M.Smith, 1913
- Tetraedroides B.M.Griffiths, 1923
- Tetraedron Kützing, 1845
- Tetrallantos Teiling, 1916
- Tetranephris C.R.Leite & C.E.M.Bicudo, 1977
- Tetrapedia Reinsch, 1866
- Tetraptera A.Rasumov, 1923
Tetraselmis F.Stein, 1878
- Tetraselmis alacris Butcher, 1959
- Tetraselmis apiculata (Butcher) Butcher, 1959
- Tetraselmis arnoldii (Proshkina-Lavrenko) R.E Norris, Hori & Chihara, 1980
- Tetraselmis ascus (Proskauer) R.E.Norris, Hori & Chihara, 1980
- Tetraselmis astigmatica R.E.Norris & Hori, 1982
- Tetraselmis bilobata (Roukhiyajnen) R.E.Norris, Hori & Chihara, 1980
- Tetraselmis chuii Butcher, 1959
- Tetraselmis contracta (N.Carter) Butcher, 1959
- Tetraselmis convolutae (Parke & Manton) R.E.Norris, Hori & Chihara, 1980
- Tetraselmis cordiformis (H.J.Carter) Stein, 1878
- Tetraselmis desikacharyi Marin, Hoef-Emden & Melkonian, 1996
- Tetraselmis fontiana (Margalef) R.E.Norris, Hori & Chihara, 1980
- Tetraselmis gracilis (Kylin) Butcher, 1959
- Tetraselmis guangdongensis Zhang & Hu, 2002
- Tetraselmis hazeni Butcher, 1959
- Tetraselmis helgolandica (Kylin) Butcher, 1959
- Tetraselmis impellucida (McLachlan & Parke) R.E.Norris, Hori & Chihara, 1980
- Tetraselmis inconspicua Butcher, 1959
- Tetraselmis indica Arora & Anil, 2013
- Tetraselmis levis Butcher, 1959
- Tetraselmis limnetis Stokes, 1885
- Tetraselmis maculata Butcher, 1959
- Tetraselmis marina (Cienkowski) R.E.Norris, Hori & Chihara, 1980
- Tetraselmis mediterranea (Lucksch) R.E. Norris, Hori & Chihara, 1980
- Tetraselmis micropapillata (Ålvik) Butcher, 1959
- Tetraselmis striata Butcher, 1959
- Tetraselmis subcordiformis (Wille) Butcher, 1959
- Tetraselmis suecica (Kylin) Butcher, 1959
- Tetraselmis tetrabrachia
- Tetraselmis tetrathele (West) Butcher, 1959
- Tetraselmis verrucosa Butcher, 1959
- Tetraselmis viridis (Rouchijajnen) R.E.Norris, Hori & Chihara, 1980
- Tetraselmis wettsteinii (J.Schiller) Throndsen, 1988
Chlorophyta → Prasinophyceae → Chlorodendrales → Chlorodendraceae
- Tetrasoma Corda
- Tetraspora Link ex Desvaux, 1818
- Tetrasporaceae
- Tetrasporales
- Tetrasporella B.Gaillon, 1833
- Tetrasporidium Möbius, 1893
- Tetrastrum Chodat, 1895
- Tetratoma Buetschli, 1884
Th
- Thamniochaete
- Thamniochaete F.Gay, 1893
- Thamniochloris P.[J.L.] Dangeard, 1966
- Thamniolum Woronichin, 1937
- Thelesphaera Pascher, 1943
- Thoracomonas Korshikov, 1925
- Thorakochloris Pascher, 1932
Ti
- Tingitanella Bourrelly & Gayral, 1950
To
- Tomaculum Whitford, 1943
- Topaczevskiella Massjuk, 1985
Tr
- Trebouxia Puymaly, 1924
- Trebouxiaceae
- Trebouxiales
- Trebouxiophyceae
- Trebouxiophyceae incertae sedis
- Trebouxiophyceae ordo incertae sedis
- Tremella Linnaeus, 1753
- Trentepohlia Martius, 1817
- Trentepohliaceae
- Trentepohliales
- Treubaria C.Bernard, 1908
- Treubariaceae
- Trichloridella P.C.Silva, 1970
- Trichodictyon Kützing
- Trichodiscus Welsford, 1912
- Trichophilus Weber-van Bosse, 1887
- Trichosarcina H.W.Nichols & Bold, 1965
- Trichosolen Montagne, 1861
- Trichothyra R.Nielsen & J.McLachlan, 1986
- Tricladia
- Trigonidiella P.C.Silva, 1970
- Trinocladus R.Raineri
- Trinodella V.P.Maslov & E.I.Kulik
- Triploporella J.H.C.G.G.Steinmann
- Triptera A.I.Proshkina-Lavrenko, 1945
- Trochiscia Kützing, 1834
- Trochisciopsis Vinatzer, 1975
- Trochogonium Ehrenberg
- Troitskiella Skvortzov
- Truncatulus I.Suto, 2006
- Trypothallus Hooker f. & Harvey
Ts
- Tsumuraia Skvortzov
Tu
- Tumulofilum H.Berger, 1941
- Turbochara Z.Wang, 1978
- Turkmeniaria Maslov
Tussetia Pascher, 1927
- Tussetia elaiogenetes Moewus, 1935
- Tussetia polytomoides Pascher, 1927
Chlorophyta → Chlorophyceae → Volvocales → Chlamydomonadaceae
Ty
- Tydemania Weber-van Bosse, 1901