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Cyanophyceae: Nostocales: Oscillatoriaceae

 Spirulina sp.
Turpin 1829 ex Gomont 1892

Family: Trichome (filamentous structure) lacks heterocysts; with equal diameter throughout whole length; no hair-like structure; no branching.
Genus: (Illustrations of The Japanese Fresh-water Algae, 1977).

Spirulina, cell body μm long, 6.5 μm wide, x 100, x 200, x 400, x 640, Shimo-yanagi, Showa town, Saitama Pref., Japan, August 2003 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
Spirulina Spirulina Spirulina

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