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Gamophyceae: Zygnematales: Desmidiaceae

Cosmarium margaritatum
(P. Lundell) J. Roy & Bisset

Species: Cell body 78-90 μm long, 70-72 μm wide, L/W=1.20-1.25, isthmus 22-25 μm wide; semicells subrectangular, basal angles rounded, lateral margins convex, anical angles broadly rounded, apex truncate and flat; cell wall regularly granulated, between the granules finely punctated; side view of the semicells subcircular, vertical view oblong-elliptic; zygospores spherical or slightly depressed, with yellowish smooth wall, surrounded by mucilagenous sheath, 44.8-47.6 μm in diam. (Photomicrographs of the Freshwater Algae, vol. 3, 1985).
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var. margaritatum: Cell body 66-105 μm long, 56-82 μm wide,
Cosmarium margaritatum
v. margaritatum ?
79,80 x μm
rice field
Ichinoseki
Iwate, 2005
Cosmarium margaritatum
v. margaritatum
80 x 84 μm
Niigata, 2001
Cosmarium margaritatum
v. margaritatum ?
or C. quadrum ?
μm
Omine-numa
Tsukiyono
Gunma, 2003
Cosmarium margaritatum
v. margaritatum
79 x 84 μm
near City Hall
Fujimi
Saitama, 2004
Cosmarium margaritatum
v. margaritatum
75 x 70 μm
Iida-shinden
Nishi-ku
Saitama, 2004
Cosmarium
v. margaritatum
66 x 63 μm
Kurihashi
Saitama, 2001
Cosmarium margaritatum
v. margaritatum
72 x 76 μm
Tsukamoto
Sakura-ku
Saitama, 2004
Cosmarium margaritatum
v. margaritatum
x 73 μm
Koegawa
Konan
Saitama, 2004
Cosmarium
v. margaritatum
62 x 64 μm
65 x 65 μm
Inari Park
Toyama, 2006
Cosmarium
v. margaritatum
81 x 82 μm
Imou bog
Toyohashi
Aichi, 2004
Cosmarium quadrum
v. margaritatum
μm
Yamakado m.
Nishi-Asai
Shiga, 2008
var. minor: Cell body 58-59 μm long, 58-59 μm wide,
Cosmarium margaritatum
f. minor
or C. quadrum ?
66 x 59 μm
Myoyo
Fukiage
Saitama, 2004
Cosmarium
v. margaritatum ?
or C. quadrum ?
51 x 51 μm
Kayoicho-ike
Fukuoka, 2001
Cosmarium margaritatum
v. margaritatum ?
45 x 45 μm
Umi-no-nakamichi
Fukuoka, 2001
Similar species -->> C. quadrum; C. subalatum; C. logiense;

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Cosmarium margaritatum
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