Species [ var. coarctatum ]: Cell body 24-33.3 μm long, 28-40 μm wide,
L/W=, isthmus 6.5-9 μm wide; corners rounded, slightly curved upward;
apex slightly concave.
[ var. subcurtum Nordstedt ]: Cell body 20-28 μm long, 16-28.7 μm wide, L/W=, isthmus 5.5-12 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977) |
31 μm
63 μm
94 μm; x 640
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
