Order & Family: Floating unicells or a colony embedded in a matrix; no differentiation of apical and base structures; only one family.
Genus: A colony of spherical cells; each cell is not covered with a sheath, instead cells are scattered within a gelatinous matrix; the distance between cells is usually shorter than their diameter (Illustrations of The Japanese Fresh-water Algae, 1977).

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Cell body larger than 3 μm in diam.
Microcystis sp. Umi-no-nakamichi Fukuoka, 2001	Microcystis sp. μm Tsuchiura Ibaraki, 2002	Microcystis sp. 4-6 μm Koshigaya Saitama, 2001	Microcystis sp. 4.5-5 μm φ Kaga Ishikawa, 2000
Microcystis sp. μm Zenko-ji Nagano, 2003	Microcystis sp. μm Saitama, 1999	Microcystis sp. 4-5 μm φ Saiko Toda Saitama, 2005	Microcystis sp. μm Japan, 2000
Microcystis sp. μm Tochigi, 2001	Microcystis sp. 5-6 μm φ Katakai-numa Zao onsen Yamagata, 2008
Microcystis sp. ? μm Tachikawa Tokyo, 2001	Microcystis sp. ? μm φm Shiroyama Park Okegawa Saitama, 2002	Microcystis sp. ? μm Wakamiya Park Matto Ishikawa, 2002	Microcystis sp. ? μm Kozuki Pond Takamatsu Kagawa, 2002
M. marginata ? 7 x 5.5 μm Niigata, 2001	M. flos-aquae ? or M. marginata ? μm Saitama, 1999	M. flos-aquae or Aphanocapsa ? μm Mashiko Tochigi, 1999	M. flos-aquae or Aphanocapsa ? 6-7 μm Showa Memorial p. Tokyo, 2001
M. flos-aquae 8-9 x 7 μm Chiba-Minato Park Chiba, 2003	Microcystis ? 4.5 x 3.5 μm Tochigi, 2001	Microcystis sp.1 3 μm φm Kashiwa Chiba, 2002	Microcystis sp. 4-4.5 x 3-3.5 μm Senganpi Suigo p. Saitama Saitama, 2005
Cell body smaller than 3 μm in diam.
Microcystis sp.3 μm Uruguay, 1999	M. convoluta ? μm Uruguay, 1999	Microcystis sp.4 μm Kuroiso Tochigi, 2001	Microcystis sp.4 μm Seseragi Park Musashi-Urawa Saitama, 2002
Microcystis sp.5 μm Japan, 1998	Microcystis ? μm Chikozan park Saitama, 2001	Microcystis sp. μm Numappara marsh Kuroiso Tochigi, 2003	Microcystis sp. μm Numappara marsh Kuroiso Tochigi, 2003
Microcystis sp. 2-4 μm Iyari marsh Omachi Nagano, 2007	Microcystis ? μm Fujimi-hotaru-shinsui Okegawa Saitama, 2006	Microcystis ? μm Tane-ike Togakushi highland Saitama, 2006

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