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Cosmarium contractum var. minutum Desmid Species Outer Hebrides

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Phylum: Charophyta   Family: Desmidiaceae

Cosmarium contractum var. minutum  (Delponte) Coesel

It would seem to be genuinely rare and distribution little known. Found in similar habitats to the nominate

Coesel, P.F.M. & Meesters, K.J. (2007) Mesotaeniaceae and Desmidiaceae of the European Lowlands