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Cyanophyceae: Nostocales: Oscillatoriaceae

 Oscillatoria nigra
Vaucher 1803

Species: Trichome straight, but slightly curved at terminals, both ends rounded, 8.5-9 μm wide, L/W=0.3-1.0; septum not constricted, granules present along septum (Illustrations of The Japanese Fresh-water Algae, 1977).

Oscillatoria nigra Vaucher ?, cell body 3-6 μm long, 7 μm wide, L/W=0.4-0.9, x 640, Watarase river, Ashikaga city, Tochigi Pref., Japan, February 1, 2004 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Oscillatoria Oscillatoria

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