Cosmarium pseudotrachypleurum Van Westen & Coesel (2022) is illegitimate, as it is a later homonym of Cosmarium pseudotrachypleurum Noda & Skvortzov (1969). We therefore propose Cosmarium trachypleuroides as a new name for Cosmarium pseudotrachypleurum Van Westen & Coesel (2022).

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Desmidiologische Mededelingen

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M.C. van Westen, & P.F.M. Coesel. (2023). Cosmarium trachypleuroides nom. nov. Van Westen & Coesel. Replaced name: Cosmarium pseudotrachypleurum Van Westen & Coesel. Desmidiologische Mededelingen, 11, 9–9.