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Staurodesmus controversus Desmid Species Outer Hebrides

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Phylum: Charophyta   Family: Desmidiaceae

Staurodesmus controversus (West & G.S. West) Teiling 1967

First described by West & G.S. West (1894, p. 9) as Arthrodesmus controversus. The similar but larger taxon they named as Arthrodesmus crassus. Teiling (1967, p. 503) moved both species to the new genus Staurodesmus. The well-defined size-boundaries of these two taxa were later blurred with intermediate forms prompting Coesel & Meesters (2013, p. 19) to make crassus a variety of the former. A rare species, most likely to be found in Atlantic regions in oligotrophic acidic waters.

References: 
Coesel, P.F.M. & Meesters, K.J. (2013) European Flora of the Desmid Genera Staurastrum and Staurodesmus.
Teiling, E. (1967) The Desmid Genus Staurodesmus. A taxonomic study.
West, W. & West, G.S. (1894) New British freshwater algae.
West, W. & West, G.S. (1903) Scottish Freshwater Plankton. No I.

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