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Gamophyceae: Desmidales: Desmidiaceae
(Charophyceae: Zygnematales: Desmidiaceae)

 Micrasterias pinnatifida
(Kützing) Ralfs 1848

Micrasterias pinnatifida Genus: Cell body flat, large, variable in shape, longer than wide; strong constriction at center; each semicell with several notches; cell wall with many short spines (Illustrations of The Japanese Fresh-water Algae, 1977).
Species: cell body 77 μm long, 73 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977).

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Micrasterias pinnatifida (Kützing) Ralfs, cell body 64 μm long (semicell 32 μm long), 68 μm wide, isthmus 9-10 μm wide, x 400, x 640, Hiroshima Pref., Japan, Sep 28, 1998 by Y. Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400
Micrasterias
scale 31 μm scale 63 μm scale 94 μm; x 640
Micrasterias

Micrasterias pinnatifida (Kützing) Ralfs: Cell length = width; strong constriction at center; semicells separated into three parts; anterior part subdivided into two parts which are widely opened and directed horizontally; all parts tapered with apical notches; cell wall smooth; 58-68 μm long (& wide), constriction 11-15 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977).

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