Viridiplantae Cavalier-Smith, 1981 - green plants see Subkingdom Viridiplantae Caval.-Sm. (1981)
   Chlorophyta Pascher (1914) - green algae
     prasinophytes
       Pycnococcaceae R.R.L. Guillard (1991)
         1 Genus Pycnococcus R.R.L. Guillard (1991)
         2 Genus Pseudoscourfieldia I. Manton (1975)