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 var. subproductum ?), cell body 34 μm long, 33 μm wide, isthmus 10 μm wide, x 640, near Lake Aoki, Omachi city, Nagano Pref., Japan, May 8, 2006 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Staurastrum punctulatum Staurastrum punctulatum Staurastrum punctulatum Staurastrum punctulatum

Images of collecting locality: near Lake Aoki, Omachi city, Nagano Pref., Japan, May 8, 2006 by Y. Tsukii

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