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Cosmarium margaritiferum Desmid Species Outer Hebrides

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Phylum: Charophyta   Family: Desmidiaceae

Cosmarium margaritiferum Meneghini ex Ralfs 1848

A common desmid from vegetated loch-margins and moorland pools, and occasionally with Sphagnum. It prefers less acidic and more mesotrophic conditions. It can often sport a large central papilla surrounded by a gradation of granules, the disposition of which is extremely variable. In apical and side view they show as a protuberance. Similar is size and shape to Cosmarium kirchneri and Cosmarium luxuriosum but those species have defining characters.

References: 
Kouwets, F.A.C. (in manuscript) European Flora of the Desmid Genus Cosmarium
West, W. & West, G.S. (1908) A Monograph of the British Desmidiaceae, Volume 3
Coesel, P.F.M. & Meesters, K.J. (2007) Mesotaeniaceae and Desmidiaceae of the European Lowlands

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