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Gamophyceae: Zygnematales: Desmidiaceae or Closteriaceae

Closterium rostratum
Ehrenberg ex Ralfs 1848

Closterium Species: Cell body medium in size, slightly curved, central region spindle-shaped, both side convex, both termini slightly swelled, with slanted edges (cf. C. ralfsii), 190-(320-400)-530 μm long, 18-(29-33) μm wide, L/W=11-16; cell wall striated (10 lines within 10 μm), brownish in color; chloroplasts with 3 laminae, 3-5 pyrenoids in each semicell (Illustrations of The Japanese Fresh-water Algae, 1977).


Closterium rostratum Ehrenberg, cell body 275 μm long, 26 μm wide, L/W=10.6, x 400, x 640, Yacho-no-mori marsh (near road sign No. 2), Sukawa highland, Kurikoma mountain, Higashi-naruse village, Akita Pref., Japan, July 24, 2005 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
Closterium Closterium Closterium
Cell body 280 μm long, 25 μm wide, L/W=11.2, x 400, x 640
Closterium Closterium Closterium
Cell body 250 μm long, 26 μm wide, L/W=9.6, x 400, x 640
Closterium Closterium Closterium Closterium

Closterium striolatum Ehrenberg var. striolatum, cell body 245 μm long, 26 μm wide, L/W=9.4, x 400, x 640, Nagori-ga-hara (bog), Sukawa highland, Kurikoma mountain, Ichinoseki city, Iwate Pref., Japan, July 24, 2005 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
Closterium Closterium Closterium


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