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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 54 μm long, 18 μm wide, L/W=3.0, x 640, No. 9-1, Mida-ga-hara (bog/marsh), Gassan (mountain), Tsuruoka city (formerly Haguro town) & Shonai town (formerly Tachikawa town), Yamagata Pref., Japan, August 3, 2006 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Tetmemorus
Cell body 57 μm long, 18.5 μm wide, L/W=3.1, x 640
Tetmemorus Tetmemorus

Images of collecting locality: No. 9, Mida-ga-hara (bog/marsh), Gassan (mountain), Tsuruoka city (formerly Haguro town) & Shonai town (formerly Tachikawa town), Yamagata Pref., Japan, August 3, 2006 by Y. Tsukii

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