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Cyanophyceae: Nostocales: Nostocaceae

 Anabaena sp.
Bory de St. Vincent 1822 sensu Rippka et al. 1979 (Bergey's Manual 2nd. 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; filments solitary or agglutinate within a gelatinous matrix (Illustrations of The Japanese Fresh-water Algae, 1977).

Anabaena, cell body 2.5-4.5 μm long, 3 μm wide, x 640, rice field, Senuki, Takaku-kou, Nasu town, Tochigi Pref., Japan, October 31, 2004 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Anabaena Anabaena

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