Gamophyceae:
Zygnematales: Desmidiaceae
Cosmarium alpestre
Roy et Bisset
= Actinotaenium alpestre Roy et Bisset
Species:
Cell body medium in size, body length about 4/3 longer than its width,
(67-76)-90-105 μm long, (50-62)-75-90 μm wide,
constriction (49-56)-79 μm wide; semicell half-circle in shape, apex slightly fattened;
cell body covered with minute granules but smooth at the constriction zone;
apical view of the cell body broad ellipsoidal (Illustrations of the Japanese fresh-water algae, 1977).
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Similar species -->>
C. connatum;
Cosmarium alpestre Roy et Bisset, axenic culture with KCM & Hyponex (from August 25, 2004 to October 2, 2004),
cell body 66 μm long, 48 μm wide, isthmus 45 μm wide,
x 640, Numappara marsh, Nasu-shiobara city (formerly Kuroiso city), Tochigi Pref., Japan, August 2003 by Y. Tsukii
31 μm
63 μm
94 μm; x 640
Cosmarium alpestre Roy et Bisset:
Cell body medium in size, body length about 4/3 longer than its width,
(67-76)-90-105 μm long, (50-62)-75-90 μm wide,
constriction (49-56)-79 μm wide; semicell half-circle in shape, apex slightly fattened;
cell body covered with minute granules but smooth at the constriction zone;
apical view of the cell body broad ellipsoidal (Illustrations of the Japanese fresh-water algae, 1977).
Cosmarium connatum Brébisson:
Cell body large in size, body length about 4/3 longer than its width,
(62-87)-100 μm long, (45-70)-74 κm wide,
constriction 37-53 μm wide;
semicell ellipsoidal at front view, nearly circular at side view and cicular or broad ellipsoidal at apical view;
cell wall covered with many small pores and dots (Illustrations of the Japanese fresh-water algae, 1977).
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