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Cyanophyceae: Nostocales: Oscillatoriaceae

 Phormidium sp.

Genus: A single trichome within a mucilaginous sheath (Illustrations of The Japanese Fresh-water Algae, 1977).
Species:

Phormidium sp. (or Oscilatoria lucidum (Agardh) Kützing ?), trichome 12 μm in diam., x 100, x 200, x 400, Japan 199? 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 Oscillatoria Oscillatoria

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