Class Cyanoprokaryota Komárek & Golubić 1990 nom. nud. - cyanoprokaryotes
   Subclass Nostocophycidae Hoffmann, Komárek & Kaštovský (2005), nom. inval. [monotypic]
     Order Nostocales Borzì (1914) see Order Nostocales corrig. Borzì 1914
       Family Stigonemataceae Borzì (1892), nom. cons. see Family Stigonemataceae corrig. (Agardh ex Bornet and Flahault 1886) Borzì 1892 nom. cons.
         1 Genus Capsosira Kütz. ex Bornet & Flahault (1886) see Genus Capsosira Kützing ex Bornet and Flahault 1886
         2 Form genus Cyanobotrys L. Hoffmann (1991), nom. illeg. see Genus Cyanobotrys Hoffmann 1991 nom. illeg.
         3 Form genus Desmosiphon A. Borzì (1907) see Genus Desmosiphon Borzì 1907
         4 Form genus Doliocatella Geitler (1933) see Genus Doliocatella Geitler 1933
         5 Form genus Homoeoptyche H. Skuja (1944) see Genus Homoeoptyche Skuja 1944
         6 Form genus Nematoplaca Geitler (1933) see Genus Nematoplaca Geitler 1933
         7 Form genus Pulvinularia Borzì (1916) see Genus Pulvinularia Borzì 1916
         8 Form genus Stauromatonema Frémy (1930) see Genus Stauromatonema Frémy 1930
         9 Genus Stigonema C.Agardh ex Bornet & Flahault (1886) see Genus Stigonema Agardh ex Bornet and Flahault 1886