Gamophyceae: Zygnematales: Desmidiaceae

 Staurastrum lapponicum
(Schmidle) Grönblad f. lapponicum

Staurastrum lapponicum 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 28-42 μm long, 28-39 μm wide; constriction 8.4-11 μm wide; cell wall covered with granules, arranging in circle around each projection; semicells not twisted with each other at isthmus (Illustrations of the Fresh-water Algae, 1977).
Similar species -- >> S. muticum;

Staurastrum lapponicum (Schmidle) Grönblad f. lapponicum ?, cell body ? μm long, 25 μm wide, L/W=, isthmus μm wide, x 640, Ohnuma (a pond at Ohnuma enchi), Nasu-shiobara city (formerly Shiobara town), Tochigi Pref., Japan, April 1, 2007, by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Staurastrum lapponicum Staurastrum lapponicum Staurastrum lapponicum Staurastrum lapponicum Staurastrum lapponicum

Images of collecting locality: Ohnuma (a pond at Ohnuma enchi), Nasu-shiobara city (formerly Shiobara town), Tochigi Pref., Japan, April 1, 2007, by Y. Tsukii

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