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Gamophyceae: Zygnematales: Desmidiaceae

 Cosmarium pyramidatum
Brébisson in Ralfs

Cosmarium pyramidatum Species: Cell body 58-(64.5-95)-100 μm long, (42-56)-62 μm wide, isthmus (14-19)-20 μm wide, L/W=1.5; semicells pyramidal in shape, with flattened apex, basal corner rounded, side and apical view elliptical; cell wall dotted (Illustrations of The Japanese Fresh-water Algae, 1977).
Similar species -- >> C. pseudopyramidatum;

Cosmarium pyramidatum Brébisson in Ralfs, cell body 94 μm long, 51 μm wide, L/W=1.8, isthmus 19 μm wide, x 640, Yacho-no-mori marsh (near road sign No. 4), Sukawa highland, Kurikoma mountain, Higashi-naruse village, Akita Pref., Japan, July 24, 2005 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium pyramidatum Cosmarium pyramidatum Cosmarium pyramidatum

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