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Gamophyceae: Zygnematales: Desmidiaceae

Cosmarium obsoletum
(Hantzsch) Reinsch

Species [ var. obsoletum]: Cell body medium in size, broad elliptical (wider than length), 34-(39-50) μm long, 42-(48-53)-54 μm wide, isthmus 15.5-(21-25) μm wide; semicells semielliptical or depressed semicircular, cell wall at basal corner thickened like a papillae; cell wall punctated and dotted.
[ var. sitvense ]: Cell body relatively large in size, 57-(69-78) μm long, 67-(69-78) μm wide, isthmus 30-(39-42) μm wide (Illustrations of The Japanese Fresh-water Algae, 1977).
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var. obsoletum: Cell body 34-50 x 42-54 μm
Cosmarium obsoletum
C. obsoletum
var. obsoletum
48 x 49 μm
Yukawa-numa
Nishiwaga
Iwate, 2007
Cosmarium obsoletum
C. obsoletum
var. obsoletum
44 x 48 μm
Omine numa
Tsukiyono
Gunma, 2003
Cosmarium obsoletum
C. obsoletum
var. obsoletum
46 x 53 μm
Omine numa 6
Minakami
Gunma, 2007.4
Cosmarium obsoletum
C. obsoletum
var. obsoletum
μm
Omine numa 4
Minakami
Gunma, 2007.10
Cosmarium obsoletum
C. obsoletum
var. obsoletum
μm
Omine numa 3
Minakami
Gunma, 2008.10
Cosmarium
C. obsoletum
var. obsoletum
52 x 62 μm
Higashi-sano
Hakuba
Nagano, 2004
Cosmarium obsoletum
C. obsoletum
var. obsoletum
μm
Kashibaru m.2-4
Karatsu
Saga, 2008
var. sitvense: Cell body 57-78 x 67-78 μm
Cosmarium obsoletum
C. obsoletum
v. sitvense
68 x 70 μm
Omine numa
Tsukiyono
Gunma, 2003
Cosmarium obsoletum
C. obsoletum
v. sitvense
68 x 72 μm
Omine numa
Tsukiyono
Gunma, 2006
Cosmarium obsoletum
C. obsoletum
v. sitvense
70 x 75 μm
Omine numa 5
Minakami
Gunma, 2007.4
Cosmarium obsoletum
C. obsoletum
v. sitvense
72-75 x 67-75 μm
Omine numa 6
Minakami
Gunma, 2007.4
Cosmarium obsoletum
C. obsoletum
v. sitvense
μm
Omine numa 4
Minakami
Gunma, 2007.10
Cosmarium obsoletum
C. obsoletum
v. sitvense
μm
Omine numa 4
Minakami
Gunma, 2008
Cosmarium obsoletum
C. obsoletum
or C. ralfsii ?
μm
Omine numa
Tsukiyono
Gunma, 2003
Cosmarium obsoletum
C. obsoletum
v. sitvense
68 x 67 μm
Ko numa
Tsukiyono
Gunma, 2003
Cosmarium obsoletum
C. obsoletum
v. sitvense
65 x 64 μm
Ohnuma
Nasu-shiobara
Tochigi, 2007
Cosmarium obsoletum
C. obsoletum
v. sitvense
μm
Kareki-numa
Nikko
Tochigi, 2008
Cosmarium obsoletum
C. obsoletum
v. sitvense
73 x 70 μm
Shuku
Sakura-ku
Saitama, 2004
Cosmarium
C. obsoletum
var. sitvense
64 x 64 μm
Hiroshima, 1998
Movies
Cosmarium
C. obsoletum
v. sitvense
72 x 73 μm
Kabuto-yama
Nishi-no-miya
Hyogo, 2004
Cosmarium obsoletum
C. obsoletum
v. sitvense
79 x 78 μm
near Yamaguchi Univ.
Yamaguchi, 2004
Cosmarium obsoletum
C. obsoletum
v. sitvense
80 x 82 μm
Kashibaru marsh 6
Karatsu
Saga, 2006
Cosmarium obsoletum
C. obsoletum
v. sitvense
82.5 x 77 μm
Kashibaru marsh 5
Karatsu
Saga, 2006
Cosmarium obsoletum
C. obsoletum
v. sitvense
74 x 80 μm
Kashibaru marsh 4
Karatsu
Saga, 2006
Cosmarium obsoletum
C. obsoletum
v. sitvense
μm
Kashibaru m.3
Karatsu
Saga, 2008
Cosmarium obsoletum
C. obsoletum
v. sitvense
μm
Kashibaru m.II
Karatsu
Saga, 2008
Similar species -->> C. ralfsii; C. taxichondrum;

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Cosmarium obsoletum
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