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Cosmarium sp. (3) Desmid Species Outer Hebrides

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Phylum: Charophyta   Family: Desmidiaceae

Cosmarium sp. (3) 

There are always unknowns but some are worth airing as a useful reference source for others who may find something similar. I can only quote the ever helpful Frans Kouwets on this one: "… although some forms of C. regnellii have a central swelling, the small granule shown suggests that a very different species is at hand here. Also the apical view shows a somewhat irregular outline suggesting the presence of faint apical humps. In short: I have no idea."