Gamophyceae:
Zygnematales: Desmidiaceae or Closteriaceae
Closterium libellula
Focke var. libellula
= Closterium closterioides (Ralfs) Louis & Peeters
Species [var. libellula]:
Similar to C. navucula (not curved, spindle or boat in shape) but large;
170-(216-224)-450 μm long,
30-(42-48)-52 μm wide;
L/W = 5-8; chloroplast with 8-12 ridges;
3-5 pyrenoids in each semicell.
[ var. intermedium ]:
Smaller than var. libellula; 75-(123-174) μm long,
15-(20-32)-36 μm wide; 3-4 pyrenoids in each semicell.
[var. interruptum]:
Smaller than var. libellula, 90-(150-271)-400 μm long,
16-(25-31)-55 μm wide; chloroplast in each semicell separated into two pieces
(Illustrations of The Japanese Fresh-water Algae, 1977).
|
Closterium libellula Focke var. libellula
(or Closterium closterioides var. intermedium ?),
cell body 244 μm long, 38 μm wide, L/W = 6.4, bands present,
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
* Closterium libellula Focke var. interruptum (W. et G.S. West) Donat:
C. navicula (Brébisson) Lütkemüller:
Cell body not curved spindle or boat in shape;
24-(35-84)-93 μm long,
8-(11-20)-22 μm wide;
L/W = 3-4; a single chloroplast and 1 or 2 pyrenoids in each semicell
(Illustrations of The Japanese Fresh-water Algae, 1977).
C. libellula Focke var. libellula:
Similar to C. navucula (not curved, spindle or boat in shape) but large;
170-(216-224)-450 μm long,
30-(42-48)-52 μm wide;
L/W = 5-8; chloroplast with 8-12 ridges;
3-5 pyrenoids in each semicell
(Illustrations of The Japanese Fresh-water Algae, 1977).
C. libellula var. intermedium (Roy et Bisset) G. S. West:
Smaller than var. libellula;
75-(123-174) μm long,
15-(20-32)-36 μm wide;
3-4 pyrenoids in each semicell
(Illustrations of The Japanese Fresh-water Algae, 1977).
Please click on images for viewing enlarged.
Copyright
Protist Information Server