plantenrijk Haeckel (1866) - plants
   [Division] Protophyta Sachs 1874 - primitive plants
     Class Schizomycetes Nägeli 1857 (Approved Lists 1980) - bacteria and related forms
       Order Beggiatoales Buchanan 1957 (Approved Lists 1980) see Order Thiotrichales Garrity et al. 2005
         Family Achromatiaceae Massart 1901 (Approved Lists 1980) see Family Thiotrichaceae
           1 Genus Achromatium Schewiakoff 1893 (Approved Lists 1980)