image_list image_listE

Gamophyceae: Zygnematales: Desmidiaceae or Closteriaceae

Closterium ralfsii
Brébisson var. gracilius (Maskell) Krieger

Closterium ralfsii Species [var. ralfsii]: Cell body slightly curved, swelled at the center, gradually attenuated (cf. C. kuetzingii, C. setaceum) toward both slanted and narrow ends (cf. C. rostratum), 300-610 μm long, (30-)40-62 μm wide, L/W=6-9; cell wall brownish in color, lined (7-9/10 μm); 6-9 pyrenoids in each semicell.
[var. hybridum]: Cell body slender than var. ralfsii, slightly swelled at the center; 300-770 μm long, 24-40 μm wide, L/W=12-18.
[var. gracilius]: Cell body smaller, narrower than var. ralfsii, 140-242 μm long, 11-25 μm wide.
[var. novae-anguliae]: Cell body longe than var. ralfsii, (631-816)-1080 μm long, (23-26)-30 μm wide, L/W=28-31 (Illustrations of The Japanese Fresh-water Algae, 1977).
Similar species -->> C. kuetzingii; C. subulatum; C. rostratum;


Closterium ralfsii var. gracilius (Maskell) Krieger (or C. dianae ??), cell body 215 μm long, 14 μm wide, L/W=15.4, x 640, Omine-numa (pond/marsh), Tsukiyono town, Gunma Pref., Japan, September 2003 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 ralfsii Closterium ralfsii Closterium ralfsii


Please click on images for viewing enlarged.
Copyright Protist Information Server