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Gamophyceae: Zygnematales: Desmidiaceae

Cosmarium perincisum

Cosmarium perincisum 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 slightly longer than width, bay linear, both side separated, bay opening wide, 56 μm long, 50.4 μm wide, isthmus 16.8 μm wide; semicells ellipsoidal or reniform, each corner broadly rounded, apex slightly convex; cell wall covered with granules arranging in horizontal rows at the center of semicells, slightly radial at the periphery (Illustrations of The Japanese Fresh-water Algae, 1977).

Cosmarium perincisum Grönblad ?, cell body 56 μm long, 44 μm wide, L/W=1.3, isthmus 18 μm wide, x 640, near Ayu-kawa bridge, Motoyurugi, Fujioka city, Gunma Pref., Japan, December 11, 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 Cosmarium
Cell body 55 μm long, 45 μm wide, L/W=1.2, isthmus 18 μm wide, x 640
Cosmarium Cosmarium Cosmarium

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