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Cosmarium tetrachondrum Desmid Species Outer Hebrides

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Phylum: Charophyta   Family: Desmidiaceae

Cosmarium tetrachondrum  P. Lundell

Few data are available for this species in Britain. West & West (1905) recorded a few sites but now thought to be rare. The description calls for two granules distal of the isthmus and a series of 4–5 intra-marginal granules giving an undulate appearance. In the S.W. Loch Bi population the ismial granules are lacking

References: 
Kouwets, F.A.C. (in manuscript) European Flora of the Desmid Genus Cosmarium
West, W. & West, G.S. (1905) A Monograph of the British Desmidiaceae, Volume 2
Coesel, P.F.M. & Meesters, K.J. (2007) Mesotaeniaceae and Desmidiaceae of the European Lowlands

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