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Cyanophyceae: Chroococcales: Chroococcaceae

 Chroococcus pallidus
Nägeli

Chroococcus Genus: Unicells or a colony of spherical cells covered with a distinct sheath.
Species: Colonies consisting of many cells lacking definite layers; colonies formed by small subsets of 2, 4 or 8 cells; cell body (excluding sheath) larger than 5 μm in diameter (6 - 11 μm) (Illustrations of The Japanese Fresh-water Algae, 1977).

Chroococcus pallidus Nägeli, cell body nearly spherical, 7 μm in diam., sheath about 3 μm in thickness, x 640, Ukishima marsh (or bog), Tsugaike highland (Tsugaike Natural Park), Otari village, Nagano Pref., Japan, July 3, 2005 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
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