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Gamophyceae: Zygnematales: Desmidiaceae

Haplotaenium minutum
(Ralfs) Bando 1988
Syn. Pleurotaenium minutum (Ralfs) Delponte
Penium minutum (Ralfs) Cleve

Species [ var. minutum ]: Cell body cylindrical, 50-230 μm long, 7-18 μm wide, L/W=8-12; semicells not swelled at base, slightly tapered, with blunt and smooth ends; cell wall smooth or finely dotted; chloroplasts located along cenral axis, with about 6 laminae; pyrenoids arranged linearly, 3-7 in each semicells.
[ var. elongatum (W. et G.S. West) Cedergren ]: 257-550 μm long, 8-16 μm wide, L/W=28-40;
[ var. crassum (W. West) Krieger ]: Shorter and wider than v. minutum, 40-102 μm long, 12-20 μm wide, L/W=4-5;
[ var. cylindricum (Borge) Krieger ]: 175-300 μm long, 15.5-21 μm wide, L/W=14-15;
[ var. gracile (Wille) Krieger ]: Thinner and longer than v. minutum, 110-240 μm long, 6.5-15 μm wide, L/W=14-20;
[ var. latum Kaiser ]: Wider than v. minutum, 160-352 μm long, 19-28 μm wide, L/W=8-11 (Illustrations of The Japanese Fresh-water Algae, 1977).
Google Image Search
var. minutum: 50-230 μm long, 7-18 μm wide, L/W=8-12
Pleurotaenium minutum
var. minutum
115 x 13 μm
L/W=8.8
Sukawa highland
Kurikoma mt.
Akita, 2007
Pleurotaenium minutum
var. minutum
125 x 13.5 μm
L/W=9.3
Hachiman-numa m.
Hachimantai
Iwate, 2005
Pleurotaenium minutum
var. minutum
104 x 15 μm
L/W=6.9
Sensho-ga-hara
Shizukuishi
Iwate, 2007
Pleurotaenium minutum
var. minutum
129 x 13 μm
L/W=9.9
Mida-ga-hara
Gassan (mt)
Yamagata, 2006
Pleurotaenium minutum
var. minutum
106 x 14 μm
L/W=
Yahei-daira m.4
Azuma mt.
Yamagata, 2007
Pleurotaenium
var. minutum
115,118 x 14 μm
L/W=8.2,8.7
Midagahara
Tate-yama
Toyama, 2006
Pleurotaenium minutum
var. minutum
110 x 14.5 μm
L/W=7.6
Watasuge marsh
Tsugaike highland
Nagano, 2006
Pleurotaenium minutum
var. minutum
133 x 13 μm
L/W=10.2
Shimo-no-koike
Shiga highland
Nagano, 2004
Pleurotaenium minutum
var. minutum
102 x 15 μm
L/W=6.8
Tanohara marsh
Shiga highland
Nagano, 2006
Pleurotaenium minutum
var. minutum
105-136 x 13-16 μm
L/W=6.6-10.5
Karakemi marsh
Yasaka village
Nagano, 2005
Pleurotaenium minutum
var. minutum
119,125 x μm
L/W=9.9,10.4
Ushidome-ike
Norikura highland
Nagano, 2005
Pleurotaenium minutum
var. minutum ?
153 x 18 μm
L/W=8.5
Kodanuki marsh
Fujinomiya
Shizuoka, 2006
Pleurotaenium minutum
var. minutum
115 x 14 μm
L/W=8.2
Omotsubo marsh 1
Niimi
Okayama, 2006
Pleurotaenium minutum
var. minutum
130, 140 x 12 μm
L/W=11-12
Kashibaru m.3
Karatsu
Saga, 2006
var. latum: Wide, 160-352 μm long, 19-28 μm wide, L/W=8-11
Pleurotaenium trabecula
var. latum ?
346 x 40 μm
L/W=8.7
smooth surface
Otto-Numa
Ibaraki, 2002
Pleurotaenium minutum
var. latum
215 x 20 μm
L/W=10.8
Numappara marsh
Kuroiso
Tochigi, 2003
Pleurotaenium minutum
var. latum
242 x 20 μm
L/W=12.1
Numappara m.2
Nasu-shiobara
Tochigi, 2007
Pleurotaenium minutum
var. latum
228 x 20 μm
L/W=11.4
Numappara m.1
Nasu-shiobara
Tochigi, 2007
Pleurotaenium minutum
var. latum
143 x μm
L/W=
Omine-numa
Tsukiyono
Gunma, 2003
Pleurotaenium
var. latum
265 x 20 μm
L/W=13.3
Tashirodaira m5
Hakkoda mountain
Aomori, 2006
var. crassum: Short & wide, 40-102 μm long, 12-20 μm wide, L/W=4-5
Pleurotaenium
var. crassum ?
100 x 14 μm
L/W=7.1
Omotsubo marsh
Tetta-cho
Okayama, 2004
Pleurotaenium minutum
v. crassum
88 x 16.5 μm
L/W=5.3
Imou bog
Toyohashi
Aichi, 2004
Cosmarium
v. crassum
80 x 21 μm
L/W=3.8
Kuroyachi m.2
Hachimantai
Iwate, 2007
Cosmarium
v. crassum
80-84 x 21 μm
L/W=3.9
Sensho-ga-hara
Shizukuishi
Iwate, 2007
var. gracile: Thin & long, 110-240 μm long, 6.5-15 μm wide, L/W=14-20
Pleurotaenium
v. gracile
233 x 13 μm
L/W= 17.9
1 band-form chl.
Japan, 1998
Pleurotaenium
v. gracile
163-228 x 8-11 μm
L/W= 17-28
Hiroshima, 1998
Movies
Pleurotaenium minutum
v. gracile
265 x 10 μm
L/W=26.5
Kashibaru m.II
Karatsu
Saga, 2008
var. cylindricum: 175-300 μm long, 15.5-21 μm wide, L/W=14-15
Pleurotaenium
v. cylindricum
300 x 19 μm
L/W= 15.8
Oze-ga-hara
Katashina
Gunma, 2006
misc.:
Pleurotaenium
P. minutum ?
or diatom ?
250 x 7 μm
L/W= 35.7
Japan, 1998
Pleurotaenium minutum
P. minutum ?
or P. trabecula ?
460 x μm
L/W=
Otsuka-ike
Mito
Ibaraki, 2003

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Pleurotaenium minutum
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