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Gamophyceae: Zygnematales: Desmidiaceae

 Cosmarium cucurbitinum
f. minor (W. et. G.S. West) Lütkemüller
= Actinotaenium cucurbitinum f. minor (W. et. G.S. West) Lütkemüller

Cosmarium cucurbita Species [ var. cucurbitinum ]: Cell body medium in size, (56.5-73)-83 μm long, 26-(28-30)-33 μm wide, L/W=2.5, slightly constricted at the center; semicells semi-spindle shaped, gradually attenuated toward apex, lateral margins convex, apex broad circular; cell wall dotted.
[ f. minor ]: Smaller than var. cucurbitinum, 50-(56-60) μm long, 22.5-25-(26.5-28) μm wide (Illustrations of The Japanese Fresh-water Algae, 1977).

Cosmarium cucurbitinum (Bisset) Lütkemüller var. cucurbitinum, cell body 66 μm long, 31 μm wide, L/W=2.1, isthmus 30 μm wide, x 640, Hakkoda Gourd line, Hakkoda mountain, Aomori city, Aomori Pref., Japan, July 17, 2005 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium cucurbita Cosmarium cucurbita

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