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Gamophyceae: Zygnematales: Desmidiaceae

Cosmarium globosum
Bulnheim
= Actinotaenium globosum (Bulnheim) Teiling ?

Species [ var. globosum ]: Cell body small in size, slightly constricted at the center, 30-39 μm long, 20-28 μ wide, L/W=1.5, isthmus 19-26 μm wide; outline of semicells 2/3 of circle, apex rounded; cell wall dotted.
[ var. wollei ]: Constriction stronger than that of var. globosum, 38.5-(42-43) μm long, 24-(33-39) μm wide, L/W < 1.5, isthmus 21-(31-37) μm wide, cell wall covered with small pores.
[ var. subaltum ]: Longer than var. globosum, 31 μm long, 20 μm wide, isthmus 17 μm wide; cellwall dotted.
[ var. minus ]: Smaller than var. globosum, 17-(21-22.5) μm long, 13-(15.4)-18 μm wide, isthmus 9.5-(9.8)-15 μm wide.
[ f. minor ]: 16.8-27.4 μm long, 10.6-16.7 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977).
Google Image Search
var. globosum: Cell body 30-39 x 20-28 μm, L/W=1.5
Cosmarium
C. globosum
var. globosum ?
36 x 21 μm
L/W=1.7
Tanohara marsh
Shiga highland
Nagano, 2004
Cosmarium globosum
C. globosum
var. globosum
33 x 21 μm
L/W=1.6
Tanohara marsh
Shiga highland
Nagano, 2005
Cosmarium globosum
C. globosum
var. globosum
32-33 x 20-21 μm
L/W=1.6
Tanohara marsh
Shiga highland
Nagano, 2006
Cosmarium globosum
C. globosum
var. globosum
30-36 x 20-22 μm
L/W=1.5, 1.6
Hikage marsh
Shiga highland
Nagano, 2005
Cosmarium
C. globosum
var. globosum
30 x 18 μm
L/W=1.7
Iroha-numa
Zao mountain
Yamagata, 2006
Cosmarium
C. globosum
var. globosum ?
34 x 21.5 μm
L/W=1.6
Mida-ga-hara 9
Gassan (mt)
Yamagata, 2006
Cosmarium globosum
C. globosum
var. globosum ?
31 x 19 μm
L/W=1.6
Omine-numa 6
Minakami
Gunma, 2007
Cosmarium globosum
C. globosum
var. globosum ?
μm
L/W=
Oh-numa m.3
Hachimantai
Akita, 2007
var. subaltum: Cell body elongated (31 x 20 μm), cellwall dotted
Cosmarium globosum
C. globosum
var. subaltum
33 x 19 μm
L/W=1.7
Kannon-numa
Shimogo
Fukushima, 2005
Cylindrocystis
C. globosum
var. subaltum
30 x 17.5 μm
L/W=
Omine-numa
Minakami
Gunma, 2006
Cosmarium
C. globosum
var. subaltum
34.5 x 21 μm
L/W=2.0
Iroha-numa 2
Zao mountain
Yamagata, 2006
Cosmarium
C. globosum
var. subaltum
33 x 20 μm
L/W=1.7
Iroha-numa
Zao mountain
Yamagata, 2005
Cosmarium
C. globosum
var. subaltum
31 x 20 μm
L/W=1.6
Iroha-numa 3
Zao mountain
Yamagata, 2006
f. minor: Cell Cell body 17-27 x 11-17 μm
Cosmarium globosum
C. globosum
f. minor ?
27 x 16.5 μm
L/W=
Hachiman-numa m
Hachimantai
Iwate, 2006
Cosmarium globosum
C. globosum
f. minor ?
31 x 17 μm
L/W=
small marsh
Azuma mt.
Yamagata, 2007
Similar species -- >> C. diplosporum; C. oblongum;

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Cosmarium globosum
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