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Cyanophyceae: Nostocales: Nostocaceae

 Nostoc sp.
[Vaucher 1803] Bornet et Flahault 1886 (John et al. ed. 2002)
Vaucher 1803 (Bergey's Manual 2001)

Family: Trichome (filamentous structure) with heterocysts; with equal diameter throughout hole length; no branching; heterocysts intervening or at base.
Genus: Mucous sheath, nearly invisible; heterocysts intervening; filaments agglutinate (Illustrations of The Japanese Fresh-water Algae, 1977).

Nostoc sp., cell body 3.0-5.5 μm long, 3.5-4.0 μm wide, x 640, a small pond near Yamaguchi university, Yamaguchi city, Yamaguchi Pref., November 21, 2004, by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Nostoc Nostoc

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