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Gamophyceae: Zygnematales: Desmidiaceae

Cosmarium botrytis
Meneghini ex Ralfs 1848

Species [ var. botrytis ]: Cell body (56-59)-65-95 μm long, (50-54)-68 μm wide, isthmus (14-18)-24 μm wide; semicells pyramidal in shape, basal corner broadly rounded, apex flattened or slightly convex, side and apical view elliptical; cell wall covered with uniformly arranged granules.
[var. subtumidum ]: Cell body broader than var. botrytis, 52-80 μm long, 43-65 μm wide, isthmus 10-15 μm wide; granules at the center of semicells larger than others (Illustrations of The Japanese Fresh-water Algae, 1977).
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Cosmarium
C. botrytis
var. subtumidum
77 x 59 μm
75 x 57 μm
72 x 51 μm
Yamaguchi Univ.
Yamaguchi, 2004
Cosmarium
C. botrytis
var. subtumidum
74 x 58 μm
Shiken-zaike
Kamikawa
Saitama, 2004
Cosmarium botrytis
C. botrytis
var. subtumidum
71 x 55 μm
Senuki
Nasu
Tochigi, 2004
Cosmarium botrytis
C. botrytis
var. subtumidum
70 x 60 μm
Nagaike park
Hachioji
Tokyo, 2005
Cosmarium botrytis
C. botrytis
var. subtumidum
70 x 52 μm
66 x 45 μm
Ishinazaka
Furukawa
Miyagi, 2003
Cosmarium
C. botrytis
var. subtumidum
70 x 50 μm
Kotoku-numa
Nikko
Tochigi, 2006
Cosmarium
C. botrytis
var. subtumidum
67 x 54 μm
riverside park
Kuroiso
Tochigi, 2005
Cosmarium botrytis
C. botrytis
var. subtumidum
59-67 x μm
rice field
Ichinoseki
Iwate, 2005
Cosmarium botrytis
C. botrytis
var. subtumidum
65 x 54 μm
near Hanekura bridge
Shiki
Saitama, 2004
Cosmarium botrytis
C. botrytis
var. subtumidum
65 x 54 μm
Norin Park
Kawamoto
Saitama, 2004
Cosmarium
C. botrytis
var. subtumidum
64 x 53 μm
Imou bog
Toyohashi
Aichi, 2004
Cosmarium botrytis
C. botrytis
var. subtumidum
62 x 56 μm
Kasuga
Fukuoka, 2001
Cosmarium botrytis
C. botrytis
var. subtumidum
60 x 55 μm
Muneoka
Shiki
Saitama, 2004
Cosmarium
C. botrytis
var. subtumidum
59 x 45 μm
58 x 53 μm
62 x 56 μm
60 x 54 μm
Saitama, 1999
Cosmarium botrytis
C. botrytis
var. subtumidum
μm
near Oyomi m.
Hakuba
Nagano, 2008
Cosmarium botrytis
C. botrytis
var. subtumidum
60 x 52 μm
Motono
Chiba, 2003
Cosmarium
C. botrytis
var. subtumidum
59 x 51 μm
Nishi-Urawa
Saitama, 2001
Cosmarium botrytis
C. botrytis
var. subtumidum
57 x 50 μm
Iida-shinden
Nishi-ku
Saitama, 2004
Cosmarium botrytis
C. botrytis
var. subtumidum
55 x 50 μm
Zaike
Sakura-ku
Saitama, 2004
Cosmarium botrytis
C. botrytis
var. subtumidum
53 x μm
Kuroiso Park
Tochigi, 2003
Cosmarium botrytis
C. botrytis
55 x 52 μm
68 x 54 μm
near Takao-sakura p.
Kitamoto
Saitama, 2005
Cosmarium botrytis
C. botrytis
var. subtumidum
55 x 50 μm
Koume-kotohira p.
Kiryu
Gunma, 2006
Cosmarium
C. botrytis
or C. vexatum ?
60 x 48 μm
Shiken-zaike
Kamikawa
Saitama, 2004
Cosmarium
C. botrytis
or C. vexatum ?
53 x 43 μm
Saitama, 1999
Cosmarium
C. botrytis
or C. vexatum ?
56 x 45 μm
riverside
Abukuma river
Fukushima, 2005
Similar species -- >> C. sportella; C. vexatum;

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Cosmarium botrytis Cosmarium
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