''Pediastrum duplex'' is a
species
In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate s ...
of fresh water
green algae in the genus ''
Pediastrum
''Pediastrum'' is a genus of green algae, in the family Hydrodictyaceae. It is a photoautotrophic, nonmotile coenobial (fixed number of cells) green algae that inhabits freshwater environments.
Morphology
''Pediastrum'' is a genus usually lo ...
''.
They form nonmotile
coenobia (colonies) with a fixed number of cells. These coenobia are flat and have a circular shape. The cell bodies are polygonal, are granulated and have horn-like projections. They reproduce these autocolonies asexually. The colonies usually contain 8 to 32 cells, with examples of 4, 64 or 128 occurring rarely.
Infraspecies
''Pediastrum duplex brachylobum''
''Pediastrum duplex clathratum''
''Pediastrum duplex cohaerens''
''Pediastrum duplex duplex''
''Pediastrum duplex'' f. ''denticulatum''
Isabella & R.J. Patel
''Pediastrum duplex gracillimum''
''Pediastrum duplex regulosum''
''Pediastrum duplex reticulatum''
''Pediastrum duplex rotundatum''
''Pediastrum duplex'' var. ''asperum''
''Pediastrum duplex'' var. ''clathratum''
(A. Braun) Lagerheim, 1882
''Pediastrum duplex'' var. ''convexum''
W. Krieger
''Pediastrum duplex'' var. ''cornutum''
''Pediastrum duplex'' var. ''gracillimum''
W. West & G.S. West
''Pediastrum duplex'' var. ''irregulare''
G.R. Hegde & K. Somanna
''Pediastrum duplex'' var. ''longicorne''
W. Krieger
''Pediastrum duplex'' var. ''reticulatum''
Lagerheim, 1882
''Pediastrum duplex'' var. ''rugulosum''
Raciborski
''Pediastrum duplex'' var. ''subgranulatum''
Raciborski
References
Further reading
*John, D.M. & Tsarenko, P.M. (2002). Order Chlorococcales. In
The Freshwater Algal Flora of the British Isles. An identification guide to freshwater and terrestrial algae.(John, D.M., Whitton, B.A. & Brook, A.J. Eds), pp. 327–409. Cambridge: Cambridge University Press.
*Cao, X., Strojsová, A., Znachor, P. & Zapomelová, E. (2005). Detection of extracellular phosphatases in natural spring phytoplankton of a shallow eutrophic lake (Donghu, China). European Journal of Phycology 40: 251–258.
*Day, S.A., Wickham, R.P.,
Entwisle, T.J. & Tyler, P.A. (1995). Bibliographic check-list of non-marine algae in Australia. Flora of Australia Supplementary Series 4: vii + 276.
*Hu, H. & Wei, Y. (2006). The freshwater algae of China. Systematics, taxonomy and ecology. pp.
pls of 16 figs -iv i-xv, 1–1023. China: www.sciencep.com.
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pdf*Smoliner, C. (1983). Das zähe leben der grünalge Pediastrum duplex. Mikrokosmos 8: 241–245.
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External links
Plants described in 1829
Sphaeropleales
{{Chlorophyceae-stub