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Cyanophyceae: Nostocales: Oscillatoriaceae

 Oscillatoria jovis
Copeland

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 jovis Copeland or similar species, cell body 3.5-7 μm long, 5 μm wide, L/W=0.7-1.4, x 400, x 640, rice field, Konuma, Sakado city, Saitama Pref., Japan, July 18, 2004 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Oscillatoria Oscillatoria Oscillatoria Oscillatoria Oscillatoria

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