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Cyanophyceae: Nostocales: Oscillatoriaceae

 Oscillatoria sp.

Family: Trichome (filamentous structure) lacks heterocysts; with equal diameter throughout whole length; no hair-like structure; no branching.
Genus: Trichome without mucous sheath; straight, long, consisting of numerous cells (Illustrations of The Japanese Fresh-water Algae, 1977).

Oscillatoria or similar species ?, cell body 2.5 μm long, 12 μm wide, L/W=0.2, x 640, Shimizu-daira, Nasu town, Tochigi Pref., Japan, September 10, 2005, collected by Eizaburo Tsukii, photo by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
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