Gamophyceae:
Zygnematales: Desmidiaceae
Cosmarium contractum
Kirchner var. ellipsoideum (Elfving) W. et G.S. West
Species [var. contractum]:
Cell body 28-41 μm long, 18-31 μm wide,
isthmus 5.3-8.7 μm wide, L/W=1.5; semicells broad ellipsoid, laterally circular;
cellwall smooth or finely dotted, a single pyrenoid in each semicell.
[var. ellipsoideum (Elfving) W. et G.S. West]:
Cell body 31-51 μm long, 24-42 μm wide,
isthmus 7-12.5 μm wide, L/W=1.3; apex of semicells slightly flattened; cellwall smooth.
[f. jacobsenii (Roy) W. et G.S. West]:
Semicells exactly ellipsoid, 28-47.6 μm long, 18-36.4 μm wide,
isthmus 4.5-11.3 μm wide.
[var. minutum (Delponte) W. et G.S. West]:
Cell body 19-28 μm long, 14-22 μm wide, isthmus 4.3-5.6 μm wide;
semicells elongated ellipsoid, laterally circular, cellwall dotted.
(Illustrations of The Japanese Fresh-water Algae, 1977).
|
Similar species -- >>
C. depressum;
C. bioculatum;
C. moniliforme;
Cosmarium contractum var. ellipsoideum (Elfving) W. et G.S. West
(similar to Cosmarium aversum W. et G.S. West),
cell body 41 μm long, 25 μm wide, L/W=1.6, isthmus 8 μm wide,
x 640, Kareki-numa marsh, Nikko city (formerly Fujiwara town), Tochigi Pref., Japan, September 24, 2008 collected by Eizaburo Tsukii, photo by Y. Tsukii
31 μm
63 μm
94 μm; x 640
Cell body μm long, μm wide, L/W=, isthmus μm wide, x 640
Cosmarium contractum,
cell body μm long, μm wide, L/W=, isthmus μm wide,
x 640, Kareki-numa marsh, Nikko city (formerly Fujiwara town), Tochigi Pref., Japan, August 2, 2008, collected by Eizaburo Tsukii, photo by Y. Tsukii
31 μm
63 μm
94 μm; x 640
Images of collecting locality:
Kareki-numa marsh, Nikko city (formerly Fujiwara town), Tochigi Pref., Japan, August 2, 2008 by Eizaburo Tsukii
Please click on images for viewing enlarged.
Copyright
Protist Information Server