Pflanzenreich Haeckel (1866) - plants
   Division Euthallophyta
     Subdivision Schizophyta
       Class Schizophyceae Cohn (1879) see Class Schizophyceae Cohn 1879
         Subclass Psilonemateae
           1 Family Oscillatoriaceae Engl. (1898), nom. cons.
           2 Family Nostocaceae Eichler (1886)
           3 Family Scytonemataceae F.T. Kützing ex O. Kirchner in A. Engl. & H. Prantl (1898)
           4 Family Stigonemataceae Borzì (1886), nom. cons.