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Chlorophyceae: Chlorococcales: Scenedesmaceae

 Coelastrum astroideum
De Notaris 1867

Coelastrum 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).
Species:

Coelastrum astroideum Ne Notaris var. astrodeum, colony 30 μm in diam., cell body ovoidal, about 10 μm in diam., x 640, Kabuto-yama sizen-kansatsu ike (pond), Kabuto-yama, Nishi-no-miya city, Hyogo Pref., Japan, September 10, 2004 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Coelastrum astroideum Coelastrum astroideum

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