Gamophyceae:
Zygnematales: Desmidiaceae
Xanthidium cristatum
Brébisson ex Ralfs 1848 var. leiodermum (Roy et Bisset) Turner
Genus:
Variable in shape; strong constriction at center; semicell ellipsoidal, polygonal, etc.;
cell wall with simple or branching spines, most of them laterally aligned;
4 plate-like chloroplasts in each semicell; one or more pyrenoids in each chloroplast
(Illustrations of The Japanese Fresh-water Algae, 1977).
Species (var. fasciculatum):
Cell body (without spines) (42-48)-54 μm long, 34-39 μm wide,
isthmus (11)-13 μm wide,
semicells with two anterior, two lateral, one basal spines, without central bulging,
(Illustrations of the Fresh-water Algae, 1977).
|
Xanthidium cristatum var. leiodermum (Roy et Bisset) Turner
(or Xanthidium fasciculatum Ehrenberg var. fasciculatum ?),
cell body 54 μm long, 36 μm wide, isthmus 16 μm wide,
x 400, x 640, Vermont-Maine U.S.A., August 7-13, 1999, by Y. Tsukii
50 μm
100 μm
150 μm; x 400 :
31 μm
63 μm
94 μm; x 640
Xanthidium fasciculatum Ehrenberg var. fasciculatum:
Cell body (without spines) 44-(67) μm long, 44-59 μm wide,
isthmus 12-21 μm wide,
semicells with two anterior, two lateral, two basal spines
(Illustrations of the Fresh-water Algae, 1977).
Xanthidium cristatum var. leiodermum (Roy et Bisset) Turner:
Cell body (without spines) (42-48)-54 μm long, 34-39 μm wide,
isthmus (11)-13 μm wide,
semicells with two anterior, two lateral, one basal spines, without central bulging,
(Illustrations of the Fresh-water Algae, 1977).
Please click on images for viewing enlarged.
Copyright 1999 Yuuji Tsukii