[Division] Thallophyta Endl. (1836)
   [Subdivision] Schizophyta
     1 [Class] Schizomycetes Nägeli (1857) see Class Schizomycetes Nägeli 1857 (Approved Lists 1980)
     2 [Class] Cyanophyceæ Schaffner (1909) see Class Cyanobacteria Cavalier-Smith, 2002