Genus: Colonies spherical, with inner empty space; cells attached to each other by a protrusion of cell wall, arranged in a single layer; cell body mostly spherical with some conical or grobular bulges; chloroplasts cup-shaped with a pyrenoid; reproduction by asexual coenobium (Illustrations of The Japanese Fresh-water Algae, 1977).
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C. microporum
colony 27 μm φ
Saitama, 1999
C. microporum ?
colony 23 μm φ
Abiko
Chiba, 2000
C. microporum ?
8-13 μm φ
Uruguay, 1999
C. microporum ?
colony 23 μm φ
Kuroiso
Tochigi, 2001
C. microporum
colony 17 μm φ
Nishi-Urawa
Saitama, 2001
