Class Cyanoprokaryota Komárek & Golubić 1990 nom. nud. - cyanoprokaryotes
   Subclass Oscillatoriophycidae Hoffmann, Komárek & Kaštovský (2005), nom. inval.
     Order Chroococcales Ardissone (1887) see Order Chroococcales corrig. Ardissone 1887
       Family Microcystaceae Elenkin (1933) see Family Microcystaceae Elenkin 1933
         1 Genus Aphanocapsa Nägeli (1849) see Genus Aphanocapsa Nägeli 1849
         2 Form genus Chondrocystis Lemmerm. (1899) see Genus Chondrocystis Lemmermann 1899
         3 Genus Gloeocapsa Kütz. (1843), nom. cons. see Genus Gloeocapsa Kützing 1843 nom. cons.
         4 Genus Microcystis Lemmerm. (1907), nom. cons. see Genus Microcystis Kützing ex Lemmermann 1907 nom. cons.
         5 Form genus Radiocystis H. Skuja (1948) see Genus Radiocystis Skuja 1948
         6 Form genus Sphaerocavum Azevedo & Sant'Anna (2003) see Genus Sphaerocavum Azevedo and Sant'Anna 2003
         7 Genus "Synechocystis" C. Sauvageau (1893) see Genus Synechocystis Sauvageau 1893