Kingdom Bacteria Cavalier-Smith 2002 stat. inval. [paraphyletic?] - bacteria see Domain Bacteria Woese et al. 1990 stat. inval.
   Subkingdom Negibacteria Cavalier-Smith 2002 stat. inval. [paraphyletic?] - negibacteria see Domain Bacteria Woese et al. 1990 stat. inval.
     Infrakingdom Glycobacteria Cavalier-Smith 2002 stat. inval. see Domain Bacteria Woese et al. 1990 stat. inval.
       Division Cyanobacteria (ex Stanier 1974) Cavalier-Smith 2002 stat. inval. see Phylum Cyanobacteria (ex Stanier 1974) Cavalier-Smith 2002 stat. inval.
         Subdivision Phycobacteria Cavalier-Smith 2002 stat. inval. see Subphylum Phycobacteria Cavalier-Smith 2002 stat. inval.
           Class Hormogoneae Cavalier-Smith 2002 nom. illeg., nom. rej. - filamentous cyanobacteria see Subclass Nostocophycideae Hoffmann, Komárek & Kaštovský (2005), nom. inval., orth. inval.
             1 Order Nostocalesᵀ Cavalier-Smith 2002 nom. illeg., nom. rej. see Order Nostocales corrig. Borzì 1914
             2 Order Stigonematales (ex Geitler 1925) Cavalier-Smith 2002 nom. illeg., nom. rej. see Order Nostocales Cavalier-Smith 2002 nom. illeg., nom. rej.