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Cyanophyceae: Nostocales: Nostocaceae

 Cylindrospermum sp.
[Kützing 1843] Bornet et Flahoult 1886 (John et al. ed. 2002)

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 with a large akinete (Illustrations of The Japanese Fresh-water Algae, 1977).

Cylindrospermum, cell body μm long, μm wide, x 640, Koaze river, Kawagoe city, Saitama Pref., Japan, March 2002 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cylindrospermum Cylindrospermum Cylindrospermum Cylindrospermum

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