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Gamophyceae: Zygnematales: Desmidiaceae

 Cosmarium quadrifarium
Lundell f. hexasticha (Lundell) Nordstedt

Cosmarium Species: Cell body medium in size, broadly elliptical, 40-(45-48)-53 μm long, 32-(37-40)-44 μm wide, isthmus 14-(16-18)-21 μm wide; semicells semicircular in shape, basal corners right-angled, 6 lines of apically-truncated warts (about 14 warts in each line) present along their margins; 2 lines of warts or granules (upper 3 & lower 4) present at the center of the semicells (Illustrations of The Japanese Fresh-water Algae, 1977).

Cosmarium quadrifarium Lundell f. hexasticha (Lundell) Nordstedt, cell body 49 μm long, 38 μm wide, L/W=17, isthmus 1.3 μm wide, x 640, Ukishima marsh (or bog), Tsugaike highland (Tsugaike Natural Park), Otari village, Nagano Pref., Japan, July 3, 2005 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium quadrifarium Cosmarium quadrifarium Cosmarium quadrifarium
Cell body 51 μm long, 40 μm wide, L/W=1.3, isthmus 16 μm wide, x 640
Cosmarium quadrifarium Cosmarium quadrifarium Cosmarium quadrifarium

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