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). |
50 μm
100 μm
150 μm; x 400 :
31 μm
63 μm
94 μm; x 640
Closterium ralfsii Brébisson var. ralfsii,
cell body 550 μm long, 67 μm wide, L/W=8.2,
x 640, Kareki-numa marsh, Nikko city (formerly Fujiwara town), Tochigi Pref., Japan, August 2, 2008, collected by Eizaburo Tsukii, photo by Y. Tsukii
50 μm
100 μm
150 μm; x 400 :
31 μm
63 μm
94 μm; x 640
