During the repeated sampling of an area of flooded machair (South Uist, Outer Hebrides) an unfamiliar Cosmarium was discovered which was superficially similar to C. lapponicum O, Borge 1913. Further research revealed that it was C. tasiussaqense R. Lenzenweger. This species was described from Tasiusaq Island within Upernavik Archipelago, Greenland from a site with a similar ecology to that on South Uist.

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Desmidiologische Mededelingen

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C. Johnson. (2024). Cosmarium tasiussaqense R. Lenzenweger – rediscovered in the Outer Hebrides. Desmidiologische Mededelingen, 12, 17–19.