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Gamophyceae: Zygnematales: Desmidiaceae

Cosmarium contractum
Kirchner

Species [var. contractum]: Cell body 28-41 μm long, 18-31 μm wide, isthmus 5.3-8.7 μm wide, L/W=1.5; semicells broad ellipsoid, laterally circular; cellwall smooth or finely dotted, a single pyrenoid in each semicell.
[var. ellipsoideum (Elfving) W. et G.S. West]: Cell body 31-51 μm long, 24-42 μm wide, isthmus 7-12.5 μm wide, L/W=1.3; apex of semicells slightly flattened; cellwall smooth.
[f. jacobsenii (Roy) W. et G.S. West]: Semicells exactly ellipsoid, 28-47.6 μm long, 18-36.4 μm wide, isthmus 4.5-11.3 μm wide.
[var. minutum (Delponte) W. et G.S. West]: Cell body 19-28 μm long, 14-22 μm wide, isthmus 4.3-5.6 μm wide; semicells elongated ellipsoid, laterally circular, cellwall dotted.
(Illustrations of The Japanese Fresh-water Algae, 1977).
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var. contractum: Semicells broad ellipsoid, 28-41 x 18-31 μm
Cosmarium contractum
C. contractum
v. contractum
41.5 x 32 μm
L/W=1.3
Yukawa-numa
Nishiwaga
Iwate, 2007
Cosmarium contractum
C. contractum
v. contractum
39 x 32 μm
L/W=1.2
Iroha-numa
Zao mountain
Yamagata, 2005
Cosmarium
C. contractum
v. contractum
39-40 x 29-32 μm
L/W=1.2-1.4
Iroha-numa 1
Zao mountain
Yamagata, 2006
Cosmarium
C. contractum
v. contractum
28 x 23.5 μm
L/W=1.2
Iroha-numa 3
Zao mountain
Yamagata, 2006
Cosmarium contractum
C. contractum
v. contractum
48 x 37 μm
L/W=
Miyatoko m.3
Minami-Aizu
Fukushima, 2008
Cosmarium contractum
C. contractum
v. contractum
32-39 x 25-28 μm
L/W=
Kashibaru marsh 5
Karatsu
Saga, 2006
Cosmarium contractum
stock Kashibaru-1
v. contractum
44 x 31 μm
L/W=
Kashibaru marsh 1
Karatsu
Saga, 2006
Cosmarium contractum
C. contractum
v. contractum
μm
L/W=
Kashibaru marsh
Karatsu
Saga, 2008
Cosmarium
C. contractum ?
v. contractum
μm
L/W=
Kitafukuda m.p.
Yuri-Honjo
Akita, 2008
Cosmarium
C. contractum
v. contractum
33.5 x 30 μm
L/W=1.1
USA, 1999
Cosmarium
C. contractum
v. contractum
34 x 27 μm
L/W=1.3
USA, 1999
Cosmarium contractum
C. contractum
v. ellipsoideum
μm
L/W=1.6
Kareki-numa m.
Nikko
Tochigi, 2008
var. ellipsoideum: apex of semicells flattened, 31-51 x 24-42 μm
Cosmarium contractum
C. contractum
v. ellipsoideum
29 x 22 μm
L/W=1.3
water reservoir
near Yamaguchi Univ.
Yamaguchi, 2004
Cosmarium contractum
C. contractum
v. ellipsoideum
μm
L/W=
Kannon-numa 11
Shimogo
Fukushima, 2008
Cosmarium
C. contractum
v. ellipsoideum
41 x 25 μm
L/W=1.6
Kareki-numa m.
Nikko
Tochigi, 2008
f. jacobsenii: Semicells exactly ellipsoid, 28-47.6 x 18-36.4 μm
Cosmarium contractum
C. contractum
f. jacobsenii
44-46 x 29-31 μm
L/W=1.5
water reservoir
near Yamaguchi Univ.
Yamaguchi, 2004
Cosmarium contractum
C. contractum
f. jacobsenii
39 x 29 μm
L/W=1.5
Koigakubo marsh
Tessei-cho
Okayama, 2004
Cosmarium contractum
C. contractum
f. jacobsenii
μm
L/W=
Kareki-numa m.
Nikko
Tochigi, 2008
Cosmarium
C. contractum ?
or C. depressum ?
29 x 24 μm
L/W=1.2
Uruguay, 1999
var. minutum: Semicells elongated ellipsoid, 19-28 x 14-22 μm
Cosmarium contractum
C. contractum
v. minutum
21 x 15 μm
L/W=1.4
Omine-numa
Minakami
Gunma, 2006
Cosmarium contractum
C. contractum
v. minutum
24 x 16 μm
L/W=1.5
Omine-numa
Minakami
Gunma, 2007.4
Cosmarium contractum
C. contractum
v. minutum
25 x 16 μm
L/W=1.6
Omine mt.
Minakami
Gunma, 2007.4
Cosmarium contractum
C. contractum
v. minutum
μm
L/W=
Omine-numa
Minakami
Gunma, 2007.10
Cosmarium contractum
C. contractum
v. minutum
μm
near Omine-numa
Minakami
Gunma, 2008
Cosmarium
C. contractum
v. minutum ?
25 x 19 μm
L/W=1.3
Kumakubo
Nasu-shiobara
Tochigi, Aug. 05
Cosmarium contractum
C. contractum
v. minutum ?
24.5 x 19 μm
L/W=1.3
Kumakubo
Nasu-shiobara
Tochigi, Dec. 05
Cosmarium
C. contractum
v. minutum
19 x 15 μm
L/W=1.3
Nanbata castle p.
Fujimi
Saitama, 2005
Cosmarium contractum
C. contractum
v. minutum
20.5 x 16 μm
L/W=1.3
Tane-ike
Togakushi highland
Nagano, 2005
Cosmarium
C. contractum
v. minutum
16 x 13 μm
L/W=1.2
Azami-ike
Norikura highland
Nagano, 2006
Cosmarium
C. contractum
v. minutum ?
18 x 15 μm
L/W=1.2
Maimeno-ike
Norikura highland
Nagano, 2006
Cosmarium contractum
C. contractum
v. minutum ?
25.5 x 20 μm
L/W=1.3
Kodanuki marsh
Fujinomiya
Shizuoka, 2006
Similar species -- >> C. depressum; C. bioculatum; C. moniliforme;

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Cosmarium contractum
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