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Cyanophyceae: Nostocales: Rivulariaceae

 Calothrix sp.
[C. Agardh 1824] Bornet et Flahault 1886 (John et al. ed. 2002)

Family: Trichome (filamentous structure) tapered from base to tail
Genus: Heterocysts present; one trichome within a sheath; coenobium absent (Illustrations of The Japanese Fresh-water Algae, 1977).

Calothrix sp., cell body μm long, μm wide, x 640, Iruma City Museum, Iruma city, Saitama Pref., Japan, March 18, 2006, by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Calothrix

Images of collecting locality: Iruma City Museum, Iruma city, Saitama Pref., Japan, March 18, 2006, by Y. Tsukii

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