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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, cell body 3-3.5 μm long, 4 μm wide, L/W=0.75-0.88, x 640, Riverside green land (near Tone river), Sawara city, Chiba Pref., Japan, October 11, 2004 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Anabaenopsis

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