Kingdom Protoctista Hogg, 1860 Phylum Chlorophyta Pascher (1914) - green algae Class Chlorophyceae Wille (1884) - chlorophytes Order Chlorococcales Pascher see Order Chlamydomonadales F.E. Fritsch Family Characiaceae (Nägeli) Wittrock Genus Hydrianum Rabenh. (1868)