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 32 μm long, 26 μm wide, L/W=1.2, isthmus 13 μm wide, x 640, rice field, near Ichinoseki Railroad Station, Ichinoseki city, Iwate Pref., Japan, July 24, 2005 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Staurastrum lapponicum Staurastrum lapponicum Staurastrum lapponicum Staurastrum lapponicum

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