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Gamophyceae: Zygnematales: Desmidiaceae

 Staurastrum forficulatum
Lundell var. forficulatum

Staurastrum forficulatum Subgenus: lacks arm-like projections
Section [ Stellatiformes ]: Semicells with lines of spines (Illustrations of The Japanese Fresh-water Algae, 1977)
Species [ var. forficulatum ]: Cell body medium in size, 40-47.6 μm long, 37-60 μm wide (excluding spines), marginal projections present at both anterior and posterior sides of semicells, corner projections with dichotomous spines.
[ var. verrucosum ]: Cell body 39-45 μm long, 37-42 μm wide (excluding spines) corner projections with trichotomous spines (Illustrations of The Japanese Fresh-water Algae, 1977)
Similar species -- >> S. sexangulare;

Staurastrum forficulatum var. verrucosum ??, cell body μm long, μm wide, L/W=, isthmus μm wide, x 640, No.9b (Mitarase-no-hotori), Kannon-numa Forest Park (pond), Shimogo town, Fukushima Pref., Japan, November 15, 2008, by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Staurastrum forficulatum Staurastrum forficulatum Staurastrum forficulatum

Images of collecting locality: No.9, Kannon-numa Forest Park (pond), Shimogo town, Fukushima Pref., Japan, November 15, 2008, by Y. Tsukii

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