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) .
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M. caldariorum
32 x 10 μm
L/W= 3.2
Numa-no-hara m.
Madarao highland
Niigata, 2006
M. caldariorum
μm
L/W=
Kurome-gawa b.
Asaka
Saitama, 2008
Similar genus -->> Roya; Netrium; Penium;
