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Gamophyceae: Zygnematales: Desmidiaceae

 Staurastrum pachyrhynchum
Nordstedt var. pachyrhynchum

Staurastrum pachyrhynchum Genus: Cell body short, radiate in shape; apical view of the cell, triangular, polygonal, ellipsoidal or spindle-shaped; zygospores formed outside of mother cells (Illustrations of The Japanese Fresh-water Algae, 1977)
Subgenus: lacks arm-like projections (Illustrations of The Japanese Fresh-water Algae, 1977)
Species:

Staurastrum pachyrhynchum Nordstedt var. pachyrhynchum, cell body μm long, 26 μm wide, L/W=, isthmus μm wide, x 640, No.11, Kannon-numa Forest Park (pond/marsh), Shimogo town, Fukushima Pref., Japan, November 15, 2008, by Y. Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400
Staurastrum pachyrhynchum Staurastrum pachyrhynchum Staurastrum pachyrhynchum Staurastrum pachyrhynchum Staurastrum pachyrhynchum

Images of collecting locality: No.11, Kannon-numa Forest Park (pond/marsh), Shimogo town, Fukushima Pref., Japan, November 15, 2008, by Y. Tsukii

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