Gamophyceae: Zygnematales: Desmidiaceae

Staurastrum muticum
Brébisson ex Ralfs

Staurastrum muticum 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: Cell body 22-(26-34)-43.5 μm long, 21-(23.7-31)-37.5 μm wide; constriction 7.5-(8.4-9.8)-12 μm wide; cell wall smooth (Illustrations of the Fresh-water Algae, 1977).
Similar species -- >> S. lapponicum f. lapponicum;

Staurastrum muticum Brébisson, cell body 25 μm long, 25 μm wide, L/W=1.0, isthmus μm wide, x 640, Obihiro-Hasshonochi (the birthplace of Obihiro) park, Obihiro city, Hokkaido, Japan, October 13, 2005 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Staurastrum muticum Staurastrum muticum Staurastrum muticum

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