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,
cell body 2.5-5 μm long, 9 μm wide, L/W=0.3-0.6,
x 640, Karakemi marsh, Yasaka village, Nagano Pref., Japan, April 24, 2005 by Y. Tsukii
31 μm
63 μm
94 μm; x 640