Genus: Cell body ellipsoidal or short cylindrical; chloroplasts plate-like.
Species: Cell body cylindrical, tapered toward both rounded ends, 20-50 μm long, 10-15 μm wide, L/W=2.5-4;
chloroplast irregularly wavy, with 2 pyrenoids
(Illustrations of The Japanese Fresh-water Algae, 1977) .
Mesotaenium caldariorum (Lagerheim) Hansgirg ?,
cell body 32 μm long, 10 μm wide, L/W=3.2,
x 640, No. 2-3, Numa-no-hara marsh (Genseikaen), Madarao highland (Niigata & Nagano Pref.), Myoko village, Niigata Pref., Japan, June 17, 2006 by Y. Tsukii
31 μm
63 μm
94 μm; x 640
Images of collecting locality:
No. 1, 2, Numa-no-hara marsh (Genseikaen), Madarao highland (Niigata & Nagano Pref.), Myoko village, Niigata Pref., Japan, June 17, 2006 by Y. Tsukii