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Cyanophyceae: Nostocales: Nostocaceae

 Nodularia spumigena
Mertens var. spuigena

Nodularia Family: Trichome (filamentous structure) with heterocysts; with equal diameter throughout hole length; no branching; heterocysts intervening or at base.
Genus: (Illustrations of The Japanese Fresh-water Algae, 1977).

Nodularia spumigena Mertens var. spuigena (or var. major (Kützing) Bornet et Flahault), cell body 3-5 μm long, 10 μm wide, L/W=0.3-0.5, x 640, Shimizu-daira, Nasu town, Tochigi Pref., Japan, September 10, 2005, collected by Eizaburo Tsukii, photo by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Nodularia
Cell body 3.5-6 μm long, 11 μm wide, L/W=0.3-0.5, x 640
Nodularia

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