[Class] Cyanobacteria "Stanier (1974)", nom. inval. - cyanoprokaryotes see Class Cyanophyceae Hauck (1885)
   Order Nostocales Borzì (1914) see Order Nostocales corrig. Borzì 1914
     Family Scytonemataceae A.B.Frank (1886) see Family Scytonemataceae corrig. Frank 1886
       Genus Petalonema Berkeley ex Correns (1889) see Genus Petalonema Berkeley ex Correns 1889