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Closterium gracile Desmid Species Outer Hebrides

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Phylum: Charophyta   Family: Closteriaceae

Closterium gracile  Brébisson ex Ralfs 1848

A widespread acidophile but will tolerate neutral conditions. Particularly common in association with Sphagnum and peaty pools. West & G.S.West (1904: p. 168, pl. 21: 14-16) recorded Closterium gracile var. elongatum but later studies proved that the species has a continuous size-range so it was not justified.

References: 
Ralfs, J. (1848) The British Desmidieae.
West, W. & West, G.S. (1904) A Monograph of the British Desmidiaceae, Volume 1.
Brook, A.J. & Williamson, D.B. (2010) A Monograph on some British Desmids.
Coesel, P.F.M. & Meesters, K.J. (2007) Mesotaeniaceae and Desmidiaceae of the European Lowlands.

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