[Class] Cyanobacteria "Stanier (1974)", nom. inval. - cyanoprokaryotes see Class Cyanophyceae Hauck (1885)
   Order Nostocales Borzì (1914) see Order Nostocales corrig. Borzì 1914
     Family Fortieaceae Komárek, Kaštovský, Mareš & Johansen (2014), nom. nud. see Family Leptobasaceae Elenkin (1917), nom. illeg.
       1 Genus Aulosira O. Kirchner ex Bornet & Flahault (1886) see Genus Aulosira Kirchner ex Bornet and Flahault 1886
       2 Genus Calochaete T.Hauer, M.Bohunická & R.Mühlsteinová (2013) see Genus Calochaete Hauer et al. 2013
       3 Genus Coleospermum Kirchner ex Frank (1886) see Genus Microchaete Thuret ex Bornet and Flahault 1886 nom. cons.
       4 Genus Fortiea G. De Toni (1936) see Genus Fortiea De Toni 1936
       5 Genus "Roholtiella" Bohunická et al. (2014), nom. ined. see Genus Roholtiella Bohunická, Pietrasiak & J.R.Johans. (2015)