Species: Cell body cylindrical, slightly depressed at center,
68-185 μm long,
14-22 μm wide;
chloroplasts with longitudinal ridges; cell wall with small granules arranged longidudinally or sometimes
irregularly; zygospores spherical or slightly elongated
(Photomicrographs of the Fresh-water Algae, 1985).
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Penium margaritaceum,
cell body 144 μm long, 22 μm wide,
x 400, x 640, Hiroshima Pref., Japan, October 1998, by Y. Tsukii
50 μm
100 μm
150 μm; x 400 :
31 μm
63 μm
94 μm; x 640