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, Shishizuka, Tsuchiura city, Ibaraki Pref., Japan, July 2003 by Y. Tsukii
94 μm; x 640
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