Polycystis (Kuetzing) Kuetzing Dataset Integrated Taxonomic Information System (ITIS) Rank GENUS Classification kingdom Bacteria phylum Cyanobacteria class Cyanophyceae order Chroococcales family Chroococcaceae genus Microcystis Name Homonyms Polycystis (Kuetzing) Kuetzing Polycystis Kölliker, 1845