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Cyanophyceae: Nostocales: Oscillatoriaceae

 Oscillatoria brevis
(Kützing) Gomont

Oscillatoria brevis Genus: Trichome without mucous sheath; straight, long, consisting of numerous cells (Illustrations of The Japanese Fresh-water Algae, 1977).
Species: Trichome straight, without constriction at cell-cell junction, tapering at both ends, 4-6.5 μm wide; cell body short, 1.5-3 μm long (1/3-1/2 of its width); granules present along septum (Illustrations of the Japanese Fresh-water Algae, 1977).

Oscillatoria brevis (Kützing) Gomont or similar species, trichome 5.0-5.5 μm wide, cell body 1.5-2.5 μm long, L/W=0.3-0.5, x 640, Near Suwa Shrine, Hasuda city, Saitama Pref., Japan, May 2002 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
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Oscillatoria brevis (Kützing) Gomont: Trichome straight, without constriction at cell-cell junction, tapered at terminal end, 4-6.5 μm wide; cell body short, 1.5-3 μm long; small granules arranged at septum (Illustrations of the Japanese Fresh-water Algae, 1977).

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