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Cyanophyceae: Nostocales: Oscillatoriaceae

 Oscillatoria acutissima
Kufferath

Oscillatoria Genus: Trichome without mucous sheath; straight, long, consisting of numerous cells (Illustrations of The Japanese Fresh-water Algae, 1977).
Species: Trichome without constriction; cell body elongated, 3-7 μm long, 1.5-2 μm wide; (Illustrations of The Japanese Fresh-water Algae, 1977).

Oscillatoria acutissima Kufferath ?, cell body 3-6.5 μm long, about 1.2 μm wide, L/W=2.5-5.4, x 640, Furu-tone river, Kasukabe city, Saitama Pref., Japan, February 15, 2004 by Y. Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400 : scale 31 μm scale 63 μm scale 94 μm; x 640
Oscillatoria Oscillatoria

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