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
31 μm
63 μm
94 μm; x 640