Gamophyceae: Zygnematales: Desmidiaceae

 Staurastrum punctulatum
[Brébisson] Ralfs var. punctulatum

Staurastrum punctulatum Species: Cell body 24-40.5 μm long, 21-36.5 μm wide, isthmus 8.4-16 μm; semicells slightly twisted with each other; apical view triangular with each margin slightly convexed; side view elliptical diamond-shaped; cell wall covered with granules regularly arranged around each arm (Illustrations of The Japanese Fresh-water Algae, 1977).

Staurastrum punctulatum [Brébisson] Ralfs var. punctulatum (or S. alternans ?), cell body 32 μm long, 27 μm wide, isthmus 12 μm wide, L/W=1.2, x 640, Hannoki numa (pond), Aizu Recreation Park, Aizuwakamatsu city, Fukushima Pref., Japan, May 4, 2005 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Staurastrum punctulatum

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