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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 sp. (Nostocaceae, Nostocales, Cyanophyceae), cell body 2.5-4.5 μm long, 4.5 μm wide, heterocysts 7 μm long, 6.5 μm wide, x 640, Kitayama park, Higashi-Murayama city, Tokyo, Japan, February 11, 2004 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Anabaena

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