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 Beggiatoales Buchanan 1957 nom. inval. see Order Beggiatoales Buchanan 1957 (Approved Lists 1980)
         1 Family Achromatiaceae Massart 1901 nom. inval. see Family Achromatiaceae Massart 1901 (Approved Lists 1980)
         2 Family Beggiatoaceae Migula 1894 nom. inval. see Family Beggiatoaceae Migula 1894 (Approved Lists 1980)