plantenrijk Haeckel (1866) - plants
   [Division] Protophyta Sachs 1874 - primitive plants
     Class Schizomycetes Nägeli 1857 (Approved Lists 1980) - bacteria and related forms
       Order Actinomycetales Buchanan 1917 (Approved Lists 1980)
         Family Actinomycetaceae Buchanan 1918 (Approved Lists 1980)
           Genus Nocardia Trevisan 1889 (Approved Lists 1980)