Genus: Unicellular or colonial within a gelatinous sheath; planktonic; cell body spherical; 1 or several chloroplasts cup-shaped, with a pyrenoid (Guide book to the "Photomicrographs of the Freshwater Algae", 1998).
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, cell body
μm wide, x 640, Omine-numa (pond/marsh), Tsukiyono town, Gunma Pref., Japan, September 2003 by Y. Tsukii
94 μm; x 640
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