plantenrijk Haeckel (1866) - plants
   [Division] Protophyta Sachs (1874) - primitive plants
     Class Schizomycetes Nägeli 1857 nom. inval. - bacteria and related forms see Class Schizomycetes Nägeli 1857 (Approved Lists 1980) nom. illeg., nom. rej.
       Order Pseudomonadales Orla-Jensen 1921 nom. inval. see Order Pseudomonadales Orla-Jensen 1921 (Approved Lists 1980)
         Family Nitrobacteriaceae (sic) Buchanan 1917 nom. inval. see Family Nitrobacteraceae corrig. Buchanan 1917 (Approved Lists 1980)
           Genus Nitrosomonas Winogradsky 1892 nom. inval., nom. cons. see Genus Nitrosomonas Winogradsky 1892 (Approved Lists 1980) nom. cons.