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Gamophyceae: Zygnematales: Desmidiaceae

Cosmarium oblongum
Bennett
= Actinotaenium oblongum Bennett

Species: Cell body small in size, 50-56 μm long, 22-23 μm wide, L/W=2-2.5, slightly constricted at the center; semicells elongate ellipsoidal in shape, cell wall smooth; chloroplast laminae ridged and radially arranged (Illustrations of The Japanese Fresh-water Algae, 1977).
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Cosmarium
C. oblongum ?
55 x 20 μm
L/W=2.8
Mida-ga-hara
Gassan mt.
Yamagata, 2006
Cosmarium oblongum
C. oblongum ?
μm
L/W=
Yokotashiro 5
Oze-ga-hara
Gunma, 2006
Cosmarium
C. oblongum ?
54 x 18.5 μm
L/W=2.5
Midagahara 5
Tate-yama
Toyama, 2006
Cosmarium oblongum
C. oblongum ?
63 x 21.5 μm
L/W=
Shijuhachi-ike 4
Shiga highland
Nagano, 2006.10
xxxx
C. oblongum
51 x 20.5 μm
L/W=2.5
Watasuge marsh
Tsugaike highland
Nagano, 2006
Cosmarium oblongum
C. oblongum
41 x 17 μm
L/W=2.4
Kannon-numa
Shimogo
Fukushima, 2005
Cosmarium oblongum
C. oblongum
46 x 21.5 μm
L/W=
Shijuhachi-ike 4
Shiga highland
Nagano, 2006
Cosmarium
C. oblongum
45 x 21 μm
L/W=2.1
Tanohara marsh
Shiga highland
Nagano, 2004
Cosmarium oblongum
C. oblongum
45 x 21 μm
L/W=2.1
Tanohara marsh
Shiga highland
Nagano, 2006
Cosmarium oblongum
C. oblongum
μm
L/W=
Chigo-ike
Shiga highland
Nagano, 2008
Cosmarium oblongum
C. oblongum
μm
L/W=
Maeyama marsh
Shiga highland
Nagano, 2008
Cosmarium oblongum
C. oblongum
μm
L/W=
Kareki-numa
Nikko
Tochigi, 2008

Cosmarium oblongum
C. oblongum
or C. thwaitesii ?
44 x 21 μm
L/W=2.1
Omine-numa
Minakami
Gunma, 2006
Cosmarium oblongum
C. oblongum
or C. thwaitesii ?
44 x 21 μm
L/W=2.1
Omine-numa
Minakami
Gunma, 2007.4
Cosmarium oblongum
C. oblongum
or C. thwaitesii ?
μm
L/W=
Omine-numa 5
Minakami
Gunma, 2007.10
Cosmarium oblongum
C. oblongum
or C. thwaitesii ?
44 x 22 μm
L/W=2.0
near Kurome R.
Asaka
Saitama, 2006
Cosmarium
C. oblongum
or C. thwaitesii ?
41 x 20.5 μm
44 x 22.5 μm
Sukawa highland
Kurikoma mt.
Akita, 2007
Cosmarium oblongum
C. oblongum
41 x 22 μm
Karakemi m.5
Omachi
Nagano, 2008
Cosmarium oblongum
C. oblongum
or C. thwaitesii ?
45.5 x 22 μm
L/W=
Imou bog 3
Toyohashi
Aichi, 2006
Cosmarium
C. oblongum
or C. thwaitesii ?
40 x 21 μm
L/W=1.9
J Skunk Cabbage m
Tsugaike highland
Nagano, 2006
Cosmarium
C. oblongum
or C. thwaitesii ?
43 x 23.5 μm
L/W=
Shijuhachi-ike 5
Shiga highland
Nagano, 2006
Cosmarium oblongum
C. oblongum
or C. thwaitesii ?
40 x 20 μm
L/W=2.0
Hikage marsh
Shiga highland
Nagano, 2005
Cosmarium oblongum
C. oblongum
or C. thwaitesii ?
μm
L/W=
Shibu-ike
Shiga highland
Nagano, 2008
Cosmarium oblongum
C. oblongum
or C. thwaitesii ?
μm
L/W=
Yokotashiro 4
Katashina
Gunma, 2007
Similar species -->> C. cucurbitinum; C. thwaitesii;
Similar genus -->> Penium polymorphum;

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Cosmarium oblongum
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