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 Nostocaceae Eichler (1886) see Family Nostocaceae Eichler 1886 Genus Trichormus (J. Ralfs ex Bornet & Flahault) Komárek & Anagn. (1989) see Genus Trichormus (Ralfs ex Bornet and Flahault 1886) Komárek and Anagnostidis 1989