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Gamophyceae: Zygnematales: Desmidiaceae or Closteriaceae

Closterium rostratum
Ehrenberg ex Ralfs 1848

Closterium rostratum 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).
Similar species -- >> C. striolatum (ends broadly truncated, inner side not swelled); C. nematodes;


Closterium rostratum Ehrenberg, cell body μm long, μm wide, L/W=, x 640, No.3a, a marsh pond at Mitsuishi marsh, Hachimantai city, Iwate Pref., Japan, August 13, 2008 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Closterium rostratum Closterium rostratum Closterium rostratum

Images of collecting locality: No.3, a marsh pond at Mitsuishi marsh, Hachimantai city, Iwate Pref., Japan, August 13, 2008 by Y. Tsukii

Closterium rostratum Ehrenberg ?, cell body μm long, μm wide, L/W=, x 640, No.2b, a marsh pond at Mitsuishi marsh, Hachimantai city, Iwate Pref., Japan, August 13, 2008 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Closterium rostratum Closterium rostratum Closterium rostratum Closterium rostratum

Images of collecting locality: No.2, a marsh pond at Mitsuishi marsh, Hachimantai city, Iwate Pref., Japan, August 13, 2008 by Y. Tsukii


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