Genus: Cell body crescent in shape (long, curved, tapered at both ends); cross section rounded;
cell wall smooth or with longitudinal lines, bands on the cell wall in some species;
chloroplast laminae ridged and radially arranged, which makes cross section star-shaped;
pyrenoids aligned or scattered (Illustrations of The Japanese Fresh-water Algae, 1977).
Species:
Closterium rectimarginatum ?,
cell body 106 μm long, 10.5 μm wide, L/W=10.1,
x 640, No.2, Ko-numa (pond/marsh), Minakami town (formerly Tsukiyono town), Gunma Pref., Japan, October 12, 2008 by Y. Tsukii 50 μm
100 μm
150 μm; x 400 :
31 μm
63 μm
94 μm; x 640
Images of collecting locality:
No.2, Ko-numa (pond/marsh), Minakami town (formerly Tsukiyono town), Gunma Pref., Japan, October 12, 2008 by Y. Tsukii