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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. ? (or Homoeothrix ?), cell body μm long, μm wide, L/W=, x 400, x 640, riverside at Tokachi river (Tokachi-gawa park), Obihiro city, Hokkaido, Japan, October 13, 2005 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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