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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 4-8 μm long, 7.5 μm wide, L/W=0.5-1.1, x 640, Obihiro-Hasshonochi (the birthplace of Obihiro) park, Obihiro city, Hokkaido, Japan, October 13, 2005 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Oscillatoria Oscillatoria

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