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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 Oscillatoria sp. ?), cell body 3-6 μm long, 9 μm wide, L/W=, septum constricted, x 640, Iroha-numa (marsh), Zao mountain, Yamagata city, Yamagata Pref., Japan, July 9, 2005 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Oscillatoria Oscillatoria

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