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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 μm long, μm wide, x 640, Dojo-ike (pond), Norikura highland, Azumi, Matsumoto city (formerly Azumi village), Nagano Pref., Japan, June 8, 2006 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Nostoc Nostoc
Cell body 4-6 μm long, 4-4.5 μm wide, heterocysts 8 μm long, 6 μm wide, x 400, x 640
Nostoc Nostoc Nostoc

Images of collecting locality: Dojo-ike (pond), Norikura highland, Azumi, Matsumoto city (formerly Azumi village), Nagano Pref., Japan, June 8, 2006 by Y. Tsukii

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