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Gamophyceae: Zygnematales: Desmidiaceae

Cosmarium pyramidatum
Brébisson in Ralfs 1848

Species: Cell body 58-(64.5-95)-100 μm long, (42-56)-62 μm wide, isthmus (14-19)-20 μm wide, L/W=1.5; semicells pyramidal in shape, with flattened apex, basal corner rounded, side and apical view elliptical; cell wall dotted (Illustrations of The Japanese Fresh-water Algae, 1977).
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Apex flatted, semicell scalariform
Cosmarium pyramidatum
C. pyramidatum
82 x 47 μm
Sukawa highland
Kurikoma mountain
Akita, 2005
Cosmarium pyramidatum
C. pyramidatum
84 x 48 μm
83 x 46 μm
77 x 42 μm
Omine-numa
Tsukiyono
Gunma, 2003
Cosmarium
C. pyramidatum ?
88 x 51 μm
Omine-numa 6
Minakami
Gunma, 2007
Cosmarium pyramidatum
C. pyramidatum
83 x 46 μm
Numappara marsh
Kuroiso
Tochigi, 2003
Cosmarium
C. pyramidatum
82 x 47 μm
riverside park
Kuroiso
Tochigi, 2005
Cosmarium pyramidatum
C. pyramidatum
88 x 51 μm
Ohnuma
Nasu-shiobara
Tochigi, 2007
Cosmarium pyramidatum
C. pyramidatum
83 x 47 μm
near Ichinose-enchi
Norikura highland
Nagano, 2006
Cosmarium
C. pyramidatum ?
83 x 47 μm
Uruguay, 1999
Similar species -- >> C. pseudopyramidatum (42-61 μm); C. javanicum (112-118 μm);

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Cosmarium
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