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Gamophyceae: Zygnematales: Desmidiaceae

 Cosmarium obsoletum
var. sitvense Gutwinski

Cosmarium obsoletum Species [ var. obsoletum]: Cell body medium in size, broad elliptical (wider than length), 34-(39-50) μm long, 42-(48-53)-54 μm wide, isthmus 15.5-(21-25) μm wide; semicells semielliptical or depressed semicircular, cell wall at basal corner thickened like a papillae; cell wall punctated and dotted.
[ var. sitvense ]: Cell body relatively large in size, 57-(69-78) μm long, 67-(69-78) μm wide, isthmus 30-(39-42) μm wide (Illustrations of The Japanese Fresh-water Algae, 1977).

Cosmarium obsoletum var. sitvense Gutwinski, cell body 75 μm long, 67 μm wide (?), L/W=, isthmus ? μm wide, x 640, No.6, Omine-numa (pond/marsh), Omine, Minakami town (formerly Tsukiyono town), Gunma Pref., Japan, April 15, 2007 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium obsoletum Cosmarium obsoletum
Cell body 75 μm long, 74 μm wide, L/W=1.0, isthmus 46 μm wide, x 640
Cosmarium obsoletum
Cell body 72 μm long, 75 μm wide, L/W=1.0, isthmus 38 μm wide, x 640
Cosmarium obsoletum Cosmarium obsoletum Cosmarium obsoletum

Images of collecting locality: No.6, Omine-numa (pond/marsh), Omine, Minakami town (formerly Tsukiyono town), Gunma Pref., Japan, April 15, 2007 by Y. Tsukii

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