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Chlorophyceae: Chlorococcales: Scenedesmaceae

Scenedesmus acuminatus
(Lagerheim) Chodat

Genus: Colonies of 4 (or 2, 8, 16) cells attached side by side, arranged linearly or zigzag; cell body elliptical or spindle or crescent in shape; terminal cells with spiny projections in many species; cell wall usually smooth, but in some species granulated or dented or ridged (Illustrations of The Japanese Fresh-water Algae, 1977).
Species [ var. acuminatus ]: Colonies of 4 or 8 cells; cells arranging linearly (4 cells) or zigzag (8 cells); cell body elongated spindle-shaped, outer cells curved outward, 12-30 μm long, 2.5-6 μm wide; cell wall smooth (Illustrations of The Japanese Fresh-water Algae, 1977).
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Cells aligned side by side
Terminal cells slightly curved
Scenedesmus acuminatus
f. maximus
cell 62 x 6 μm
L/W=10.3
Japan, 1998
Scenedesmus
var. acuminatus
4-cells type
cell μm
Kodama town
Saitama, 2003
Scenedesmus acuminatus
v. acuminatus ?
8-cells type
cell 50 x 6 μm
L/W=8.3
Japan, 1998
Scenedesmus acuminatus
v. acuminatus
8-cells type
cell 27 x 4.5 μm
L/W=6.0
Japan, 1997
Scenedesmus acuminatus
v. acuminatus
cell μm
Omine-numa
Tsukiyono
Gunma, 2003
Scenedesmus acuminatus
v. acuminatus
cell 23-25 x 3.5 μm
near Yamaguchi Univ.
Yamaguchi, 2004
Scenedesmus acuminatus
v. acuminatus
cell 30-39 x 5-8 μm
Sannoh-bori
Sannoh Park
Saitama, 2005
Scenedesmus acuminatus
v. acuminatus
cell 26 x 6 μm
Futayo-no-ike
Haguro mountain
Yamagata, 2005
Scenedesmus
v. acuminatus
cell 20 x 3 μm
Hasu-ike
Shiga highland
Nagano, 2005
Scenedesmus acuminatus
v. acuminatus
cell 40 x 5.5 μm
Shirahata-Numa
Urawa
Saitama, 2005
Terminal cells strongly curved
Scenedesmus acuminatus
v. tortuosus ?
8- or 4-cells type
cell 35 x 4 μm
L/W=8.8
Japan, 1998
Scenedesmus acuminatus
v. tortuosus ?
cell 41 x 5 μm
L/W=8.2
Nanbata castle p.
Fujimi
Saitama, 2005
Cells aligned zigzag
Terminal cells slightly curved
Scenedesmus acuminatus
v. acuminatus
cell 25 x 3 μm
L/W=8.3
Mizumoto Park
Tokyo, 2001
Scenedesmus acuminatus
v. acuminatus
cell μm
Omine-numa
Tsukiyono
Gunma, 2003
Scenedesmus acuminatus
v. acuminatus
cell μm
Omine-numa
Minakami
Gunma, 2007
Scenedesmus acuminatus
v. acuminatus
cell μm
castle ruin p.
Sakura
Chiba, 2008
Scenedesmus acuminatus
v. acuminatus
inner 21 x 4.5 μm
outer 31 x 4.5 μm
Nishi-Urawa
Saitama, 2001
Scenedesmus acuminatus
v. acuminatus
cell 17 x 3.5 μm
L/W=4.9
Tatebayashi
Gunma, 2001
Scenedesmus
v. acuminatus
cell 14 x 5 μm
L/W=2.8
Lake Biwa
Maihara
Shiga, 2003
Scenedesmus acuminatus
v. acuminatus
8-cells type
cell 23 x 3 μm
L/W=7.7
Japan, 1998
Scenedesmus acuminatus
v. acuminatus
cell μm
L/W=
Higusa-numa
Hikari
Chiba, 2003
Scenedesmus acuminatus
v. acuminatus
cell 21 x 5 μm
L/W=
near Yamaguchi Univ.
Yamaguchi, 2004
Scenedesmus acuminatus
v. acuminatus
cell 22 x 4.5 μm
L/W=4.9
riverside park
Abukuma river
Fukushima, 2005
Scenedesmus acuminatus
v. acuminatus
cell 13-16 x 5 μm
L/W=2.6-3.2
Chaya-numa p.
Fukushima city
Fukushima, 2005
Scenedesmus acuminatus
v. acuminatus
cell 16 x 4-5 μm
L/W=
kenko-fukushi m.p.
Koshigaya
Saitama, 2005
Scenedesmus acuminatus
v. acuminatus
cell 14 x 3 μm
L/W=
Motoyurugi
Fujioka
Gunma, 2004
Terminal cells strongly curved
Scenedesmus acuminatus
S. acuminatus
cell μm
Showa-machi G.P.
Showa
Saitama, 2003
Scenedesmus acuminatus
S. acuminatus
cell 17 x 3 μm
L/W=5.7
Uruguay, 1999
Scenedesmus acuminatus
S. acuminatus
cell 37 x 4 μm
L/W=9.3
Saitama, 1999
Scenedesmus acuminatus
S. acuminatus
or S. javanensis ?
cell 37 x 4 μm
L/W=9.3
Iwajuku
Gunma, 2001
Scenedesmus acuminatus
S. acuminatus
cell μm
L/W=
Nishi-Urawa
Saitama, 2003
???
Scenedesmus acuminatus
S. acuminatus
or S. acutus ?
4-cells type
cell 15 x 3 μm
L/W=5.0
Japan, 1998
Scenedesmus
S. acuminatus
or S. acutus ?
stock Skg-21
cell 16 x 4 μm
L/W=4.0
Kawagoe
Saitama, 2001
Scenedesmus acuminatus
S. acuminatus
or S. acutus
f. tetradesmiformis
?
4-cells type
cell 19 x 4 μm
L/W=4.8
Koriyama
Fukushima, 2001
Scenedesmus acuminatus
S. acuminatus
or S. acutus
f. costulatus
?
cell μm
L/W=
Nishi-Urawa
Saitama, 2003
Scenedesmus acuminatus
S. acuminatus
or S. acutus ?
cell μm
L/W=
Matsubushi
Saitama, 2003
Scenedesmus acuminatus
S. acuminatus ?
cell 40 x 5 μm
L/W=8.0
Nishi-nasuno
Tochigi, 2001
Scenedesmus acuminatus
S. acuminatus ?
or S. javanensis ?
cell 30 x 5 μm
L/W=6.0
Mizumoto Park
Tokyo, 2001
Scenedesmus acuminatus
S. acuminatus
or S. acutus ?
9-15 x 3-4.5μm
Uruguay, 1999
Scenedesmus acuminatus
S. acuminatus
cell 22 x 5 μm
Hasu-ike
Shiga highland
Nagano, 2005
Scenedesmus acuminatus
S. acuminatus
cell 16 x 4 μm
riverside park
Abukuma river
Fukushima, 2005
Scenedesmus acuminatus
S. acuminatus
cell 15 x 4 μm
near Yoshino p.
Mitsukaido
Ibaraki, 2006

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Scenedesmus acuminatus
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