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Gamophyceae: Zygnematales: Desmidiaceae or Closteriaceae

Closterium ralfsii
Brébisson ex Ralfs 1848

Species [var. ralfsii]: Cell body slightly curved, swelled at the center, gradually attenuated (cf. C. kuetzingii, C. setaceum) toward both slanted and narrow ends (cf. C. rostratum), 300-610 μm long, (30-)40-62 μm wide, L/W=6-9; cell wall brownish in color, lined (7-9/10 μm); 6-9 pyrenoids in each semicell.
[var. hybridum]: Cell body slender than var. ralfsii, slightly swelled at the center; 300-770 μm long, 24-40 μm wide, L/W=12-18.
[var. gracilius]: Cell body smaller, narrower than var. ralfsii, 140-242 μm long, 11-25 μm wide.
[var. novae-anguliae]: Cell body longe than var. ralfsii, (631-816)-1080 μm long, (23-26)-30 μm wide, L/W=28-31 (Illustrations of The Japanese Fresh-water Algae, 1977).
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var. ralfsii: L/W=6-9; 300-610 μm long, 30-62 μm wide
Closterium
v. ralfsii
or C. macilentum ?
580 x 47 μm
L/W=12
Seseragi marsh
Shiga highland
Nagano, 2004
Closterium
v. ralfsii
266 x 32 μm
L/W=8.3
Numa-no-hara m.
Madarao highland
Niigata, 2006
Closterium ralfsii
v. ralfsii
240 x 32 μm
L/W=7.5
Kowashimizu
Suwa
Nagano, 2007
var. hybridum: L/W=12-18; 300-700 μm long, 24-40 μm wide
Closterium ralfsii
v. hybridum
450 x 36 μm
L/W=12.5
Yoshi-numa
Nasu-shiobara
Tochigi, 2006
Closterium ralfsii
v. hybridum
215 x 19 μm
L/W=11.3
Igashira park
Mooka
Tochigi, 2004
Closterium
v. hybridum
or C. macilentum ?
390 x 30 μm
L/W=13
USA, 1999
Closterium ralfsii
v. hybridum
or C. rostratum ?
480-488 x 40-42 μm
L/W=12
Koigakubo marsh
Tessei-cho
Okayama, 2004
Closterium ralfsii
v. ralfsii
390 x 31 μm
L/W=12.6
Numa-no-hara m.4
Madarao highland
Niigata, 2007
Closterium ralfsii
v. ralfsii
410 x 33 μm
L/W=12.4
Numa-no-hara m.1
Madarao highland
Niigata, 2007
Closterium ralfsii
v. ralfsii
or C. macilentum ?
550 x 46 μm
L/W=12.0
Iyari marsh 2
Omachi
Nagano, 2008
Closterium ralfsii
v. ralfsii
μm
L/W=
Iyari marsh 1
Omachi
Nagano, 2008
Closterium ralfsii
v. ralfsii
μm
L/W=
Iyari marsh 2
Omachi
Nagano, 2008
Closterium ralfsii
v. ralfsii
μm
L/W=
Okahotto-Yatsu
Abiko
Chiba, 2008
Closterium ralfsii
v. ralfsii
μm
L/W=
Tonbo-no-numa
Isumi
Chiba, 2007
Closterium
v. ralfsii ?
500 x 40 μm
550 x 67 μm
Kareki-numa m
Nikko
Tochigi, 2008
Closterium ralfsii
v. ralfsii ?
390 x 33 μm
L/W=11.8
Yamakado m.
Nishi-Azai
Shiga, 2008
Closterium ralfsii
v. ralfsii
500 x 35 μm
L/W=14.3
Yamamuro m.2
Maibara
Shiga, 2008
Closterium ralfsii
v. ralfsii
440 x 32 μm
L/W=13.8
Yamamuro m.8
Maibara
Shiga, 2008
Closterium
v. ralfsii
μm
L/W=
Hanadate S.W.
Yuri-Honjo
Akita, 2008
Closterium
v. hybridum
or C. kuetzingii ?
400 x 32 μm
L/W=12.5
near Akai wetland
Aizuwakamatsu
Fukushima, 2005
Closterium ralfsii
v. hybridum
or C. kuetzingii ?
434 x 35 μm
L/W=12.4
near Akai wetland
Aizuwakamatsu
Fukushima, 2008
Closterium ralfsii
v. hybridum
or C. kuetzingii ?
470 x 36 μm
L/W=13.0
Miyatoko m.1
Minami-Aizu
Fukushima, 2008
Closterium ralfsii
v. hybridum
or C. kuetzingii ?
450 x 35 μm
L/W=12.9
Miyatoko m.3
Minami-Aizu
Fukushima, 2008
Terminal shape close to C. kuetzingii but L/W close to C. ralfsii v. hybridum
Closterium kuetzingii
v. hybridum
or C. kuetzingii ?
460 x 38 μm
L/W=12.1
Igashira park
Mooka
Tochigi, 2006
Closterium ralfsii
v. hybridum
or C. kuetzingii ?
400 x 32 μm
L/W=12.5
Oyomi marsh
Hakuba
Nagano, 2006
Closterium
v. hybridum
or C. kuetzingii ?
420 x 32 μm
L/W=13.1
Kakuman-buchi
Akagi mountain
Gunma, 2005
Closterium
v. hybridum
or C. kuetzingii ?
420 x 32 μm
370 x 32 μm
L/W=13.1, 11.6
Kowashimizu
Suwa
Nagano, 2005
Closterium ralfsii
v. hybridum
or C. kuetzingii ?
390 x 32 μm
L/W=12.2
Tochigi, 2000
Closterium ralfsii
v. hybridum
or C. kuetzingii ?
374 x 33 μm
L/W=11.3
Hasu-ike
Shiga highland
Nagano, 2005
Closterium
v. hybridum
or C. kuetzingii ?
384 x 30 μm
L/W=12.8
Ichinose-enchi
Norikura highland
Nagano, 2005
Closterium ralfsii
v. hybridum
360,400 x μm
L/W=12
Furuike marsh
Togakushi highland
Nagano, 2006
Closterium ralfsii
v. hybridum
386 x 33 μm
L/W=11.7
Kodanuki marsh
Fujinomiya
Shizuoka, 2006
Closterium ralfsii
v. hybridum ?
512 x 31 μm
L/W=16.5
Kashibaru m.4
Karatsu
Saga, 2006
Closterium ralfsii
v. hybridum ?
x 28 μm
L/W=
Kashibaru m.1
Karatsu
Saga, 2006
Closterium ralfsii
v. hybridum ?
480 x 38 μm
L/W=12.6
Kashibaru m
Karatsu
Saga, 2008
var. novae-anguliae: L/W=28-31; 631-1081 μm long, 23-30 μm wide
Closterium
v. novae-anguliae
or v. hybridum ?
600 x 37 μm
L/W=16
Sanda
Hyogo, 2001
var. gracilius: Cell body small; 140-242 μm long, 11-25 μm wide
Closterium ralfsii
v. gracilius
or C. dianae ?
215 x 14 μm
L/W=15.4
Omine-numa
Tsukiyono
Gunma, 2003
Closterium ralfsii
v. gracilius
or C. rostratum ?
236, 242 x 26 μm
L/W=9.1, 9.3
Nasu
Tochigi, 2000
Similar species -->> C. rostratum; C. kuetzingii; C. subulatum;

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Closterium ralfsii
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