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Chlorophyceae: Chlorococcales: Palmellaceae

 Sphaerocystis sp.

Sphaerocystis Genus: Colonies small, spherical or aggregates in shape; sheath inconspicuous or absent; cell body spherical in shape; chloroplasts cup-shaped or plate-like (Illustrations of the Japanese fresh-water algae, 1977).
Species:

Sphaerocystis sp. ?, cell body nearly spherical, 8-11 μm in diam., x 640, Hakama marsh (or bog), Madarao highland (Niigata & Nagano Pref.), Myoko village, Niigata Pref., Japan, May 15, 2005 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
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