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Gamophyceae: Zygnematales: Desmidiaceae

 Tetmemorus laevis
(Kützing) Ralfs var. laevis

Tetmemorus laevis Species [ var. laevis ]: Cell body small in size, slightly constricted at the center, (70-120)-145 μm long, 17-(18-32) μm wide, L/W=3-4; semicells tapered from the base to ends, both ends broadly rounded with a deep incision at center; cell wall roughly dotted; lateral view spindle-shaped, tapering stronger than frontal view.
[ var. tropicus ]: Larger than var. laevis, 115-(134)-153 μm long, 24-(28) μm wide, L/W=5. (Illustrations of The Japanese Fresh-water Algae, 1977).
[var. minutus]: Cell body (37-)45-60(-75) μm long, (12-)17-20 μm wide, L/W=2.8-3.5, (Coesel & Meesters 2007).

Tetmemorus laevis (Kützing) Ralfs var. laevis, cell body 60 μm long, 29 μm wide, L/W=2.1, x 640, No.1, Shirakaba-Yachi, Komado marsh (No.6), Showa village and Tajima town, Fukushima Pref., Japan, May 21, 2007, by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Tetmemorus laevis Tetmemorus laevis
Cell body 62 μm long, 21 μm wide, L/W=3.0, x 400, x 640
Tetmemorus laevis Tetmemorus laevis

Images of collecting locality: No.1, Shirakaba-Yachi, Komado marsh (No.6), Showa village and Tajima town, Fukushima Pref., Japan, May 21, 2007, by Y. Tsukii

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