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Cyanophyceae: Nostocales: Oscillatoriaceae

 Oscillatoria iwanoffiana
(Nygaard) Geitler

Genus: Trichome without mucous sheath; straight, long, consisting of numerous cells (Illustrations of The Japanese Fresh-water Algae, 1977).
Species: Cell body 2-5 μm long, 5-9 μm wide, L/W=0.5; (Illustrations of The Japanese Fresh-water Algae, 1977).

Oscillatoria sp. ?, cell body 3.5-7 μm long, 6 μm wide, L/W=0.6-1.2, x 640, Hazama marsh, Tomita, Ashikaga city, Tochigi Pref., Japan, October 2003 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Oscillatoria Oscillatoria

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