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Cyanophyceae: Nostocales: Nostocaceae

 Anabaenopsis sp.
(Woloszynska) Miller 1923 (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 at base never become a large akinete (Illustrations of The Japanese Fresh-water Algae, 1977).

Anabaenopsis sp., cell body 3.5-7 μm long, 3.5 μm wide, x 640, Komado marsh (or bog), Showa village and Tajima town, Fukushima Pref., Japan, August 22, 2004, by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Anabaenopsis Anabaenopsis

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