Family: (Illustrations of The Japanese Fresh-water Algae, 1977).
Genus: Planktonic; colony of 4, 8 or 16 cells within a gelatinous sheath; cells arranged pyramidically covered with radial filaments; cell body spherical; a single chloroplast cup-shaped, with a pyrenoid (Guide book to the "Photomicrographs of the Freshwater Algae", 1998).
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Radiococcus sp.
cell μm
Urawa
Saitama, 2001
