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Cosmarium subcrenatum Desmid Species Outer Hebrides

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Phylum: Charophyta   Family: Desmidiaceae

Cosmarium subcrenatum Hantzsch 1868

Cosmarium crenatum and C. subcrenatum are problematic species, which were poorly described. They probably represent a species complex. Frans Kouwets (in manuscript) is attempting to sort out the confusion. I have shown Frans these images, which I think belong to his unpublished Cosmarium troumousense, which he thinks most likely. They will have to remain here until his work is published. "C. troumousense is only known from a few localities in the French Pyrenees. It apparently prefers sub-atmophytic habitats such as moss cushions in (spring) bogs and dripping rocks. It probably is an arctic-alpine form with a much wider distribution." - Kouwets (in manuscript).

References: 
Kouwets, F.A.C. (in manuscript) European Flora of the Desmid Genus Cosmarium.

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