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Cyanophyceae: Nostocales: Nostocaceae

 Cylindrospermum sp.
[Kützing 1843] Bornet & 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 sp., cell body μm long, μm wide, L/W=, x 640, No.10 (Suimei-no-hotori), Kannon-numa Forest Park (pond), Shimogo town, Fukushima Pref., Japan, November 15, 2008, by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cylindrospermum Cylindrospermum

Images of collecting locality: No.10 (Suimei-no-hotori), Kannon-numa Forest Park (pond), Shimogo town, Fukushima Pref., Japan, November 15, 2008, by Y. Tsukii

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