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Gamophyceae: Zygnematales: Desmidiaceae

 Staurastrum simonyi
var. sparse-aculeatum (Schmidle) Hirano

Staurastrum symonyi Species [ var. simonyi ]: Cell body 19-24 μm long, 18-25 μm (excluding spines), isthmus 6-7.5 μm wide, 6 short spines at each side of trianglur semicell in top view
[ var. sparse-aculeatum (Schmidle) Hirano ]: Cell body 19.6-23.7 μm long (excluding spines), 19.6-19.8 μm wide (excluding spines), isthmus 5.6-7.7 μm wide, spines equal in length (Illustrations of The Japanese Fresh-water Algae, 1977)
Similar species -- >> S. sexangulare;

Staurastrum simonyi var. sparse-aculeatum (Schmidle) Hirano, cell body 21 μm long, 21 μm wide, L/W=1.0, isthmus 8 μm wide, x 640, Hyoutan-ike (gourd pond), Shiga highland, Yamanouchi town, Nagano Pref., Japan, June 17, 2007 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Staurastrum simonyi Staurastrum simonyi Staurastrum simonyi

Images of collecting locality: Hyoutan-ike (gourd pond), Shiga highland, Yamanouchi town, Nagano Pref., Japan, June 17, 2007 by Y. Tsukii

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