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Cosmarium sp. (09) Desmid Species Outer Hebrides

Alage Outer Hebrides logo  Algae Outer Hebrides

Phylum: Charophyta   Family: Desmidiaceae

Cosmarium sp. (09) 

I thought this might be Cosmarium rectangulare at first as the size is right but the convex apex doesn't fit that species. It has more of the 'chunkiness' of a Cosmarium subtumidum but a bit on the large size and the L/B is wrong.