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).
Similar genus -->
sp. ?, cell body
μm wide, x 640, Showa-machi general park, Showa town, Saitama Pref., Japan, August 2003 by Y. Tsukii
94 μm; x 640
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