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Gamophyceae: Zygnematales: Desmidiaceae

 Cosmarium maculatum
Turner

Cosmarium maculatum Genus: Unicellular; variable in shape; a constriction at the center of the cell body; mostly longer than wide; flattened; each semicell hemispherical, spherical, ellipsoidal, rectangular, pyramidal or kidney-shaped; no apical indentation (Illustrations of The Japanese Fresh-water Algae, 1977).
Species: Cell body large in size, 138-168 μm long, 73-90 μm wide, L/W=2; constriction 39-45 μm wide; semicells half-elliptical or ovoidal; cell wall dotted (Illustrations of the Japanese fresh-water algae, 1977).
Similar species -->> C. turgidum (Eudysphinctium);

Cosmarium maculatum Turner, stock Hnka-2, axenic culture with KCM & Hyponex (October 7 to November 2, 2004), cell body 121 μm long, 70 μm wide, L/W=1.7, x 640, Kabuto-yama sizen-kansatsu ike (pond), Kabuto-yama, Nishi-no-miya city, Hyogo Pref., Japan, September 10, 2004 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium turgidum Cosmarium turgidum Cosmarium turgidum Cosmarium turgidum Cosmarium turgidum Cosmarium turgidum Cosmarium turgidum Cosmarium turgidum Cosmarium turgidum Cosmarium turgidum

Cosmarium turgidum Brébisson var. turgidum, stock Hnka-2, cell body μm long, μm wide, L/W=, isthmus μm wide, x 400, x 640, rice field, Higashi-sano (near Minami-kamishiro railway station), Hakuba village, Nagano Pref., Japan, October 3, 2004 by Y. Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400 : scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium turgidum Cosmarium turgidum
Cell body 125 μm long, 60 μm wide, L/W=2.1, isthmus 50 μm wide, x 400, x 640
Cosmarium turgidum Cosmarium turgidum Cosmarium turgidum

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