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 Pseudomonadaceae Winslow et al. 1917 nom. inval. see Family Pseudomonadaceae Winslow et al. 1917 (Approved Lists 1980)
           Genus Pseudomonas Migula 1894 nom. cons., nom. inval. see Genus Pseudomonas Migula 1894 nom. cons. (Approved Lists 1980)