plant kingdom Haeckel (1866) - plants
   Division Protophyta Sachs (1874) - primitive plants
     1 Class Schizophyceae Cohn (1879) - blue-green algae see Class Schizophyceae Knoblauch 1890
     2 Class Schizomycetes Nägeli 1857 nom. inval. - bacteria and related forms see Class Schizomycetes Nägeli 1857 (Approved Lists 1980) nom. illeg., nom. rej.
     3 Class Microtatobiotes Philip 1956 nom. inval. see Class Microtatobiotes Philip 1956 (Approved Lists 1980) nom. illeg., nom. rej.