Kingdom Chlorobionta Jeffrey, 1982 see [unranked] Chloroplastida S.M. Adl et al., 2005
   Division Chlorophyta Reichenbach (1834) - green algae sensu stricto see Phylum Chlorophyta Pascher (1914)
     Subdivision Chlorophytina see Phylum Chlorophyta Pascher (1914)
       Class Trebouxiophyceae T. Friedl (1995) - trebouxiophytes
         Order Microthamniales M. Melkonian, in L. Margulis et al., eds. (1990)