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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 Oscillatoria tenuis Agardh ?), trichome 11 μm diam., 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
Phormidium Phormidium

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