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Gamophyceae: Zygnematales: Desmidiaceae or Closteriaceae

Closterium acerosum
var. minus Hantzsch

Species: 250-(396-576)-790 μm long, 25-(33-84) μm wide; cell body large, slightly curved; both termini tapered; pyrenoids 7-15 in each semicell (Illustrations of The Japanese Fresh-water Algae, 1977). Cell body slightly curved, gradually attenuated toward the truncated ends, which somewhat recurved due to the covexity of the inner margin near the ends; inner margin straight or slightly concave, outer margin convex, 300-500 μm long, 32-50 μm wide, L/W=9-14; cell wall smooth and colorless or sometimes delicately striated and yellowish-brown in color; chloroplasts with ridges containing 7-11 pyrenoids in central row (Photomicrographs of the Freshwater Algae, vol. 1, 1984).
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Cell body small (194-410 μm); L/W=7-11
Closterium acerosum
var. minus ?
363 x 38 μm
L/W=9.5
laminae irregular
Japan, 1998
Closterium acerosum
var. minus
336 x 42 μm
L/W=8
Kisai town
Saitama, 2003
Closterium
var. minus ?
410 x 48 μm
380 x 46 μm
L/W=8.5, 8.3
laminae irregular
Yamato
Kanagawa, 2003
Closterium
var. minus ?
375 x 61 μm
L/W=6
Japan, 1998
Closterium
C. acerosum
var. minus ?
194 μm
L/W=10
Japan, 1998
Closterium
C. acerosum
var. minus ?
300 x 40 μm
L/W=7.5
Japan, 1999
Closterium
C. acerosum
var. minus ?
253 x 40 μm
L/W=6.3
Kozuki Pond
Takamatsu
Kagawa, 2002
Closterium
C. acerosum
var. minus ?
380 x 46 μm
L/W=8.3
Michi-no-eki
Tsukiyono
Gunma, 2003
Closterium
C. acerosum
var. minus
230 x 37 μm
L/W=6.8
History and folk m.
Tajima
Fukushima, 2004
Closterium
var. acerosum
205 x 30 μm
var. minus
L/W=6.8
Todoroki g.l.
Kawasaki
Kanawaga, 2004
Closterium acerosum
var. minus
282 x 33 μm
L/W=8.5
rice field
Ichinoseki
Iwate, 2005
var. minus
cell μm
Nasu-shiobara
Tochigi, 1998
Closterium acerosum
C. acerosum
var. minus ?
280 x 38 μm
L/W=7.4
Shimosorimachi
Utsunomiya
Tochigi, 2006
Closterium acerosum
C. acerosum
var. minus ?
484 x 46 μm
L/W=10.5
Kitamoto n.o.p.
Kitamoto
Saitama, 2007

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Closterium acerosum
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