Reinstatement of Tetradesmus G. M. Smith (Sphaeropleales, Chlorophyta)

Earlier and more recent history of the relationship between the desmid genera Acutodesmus and Tetradesmus (Sphaeropleales, Chlorophyta) is discussed. It is pointed out that current taxonomic treatments are using the name Acutodesmus (Hegewald) Tsarenko, which dates as a genus only from 2001. Taxonomic treatments are now including in Acutodesmus A. wisconsinensis, which is the type species of the earlier generic name Tetradesmus of G. M. Smith (1913). Because of the priority of Tetradesmus, ten taxa are transferred to that genus. (© 2015 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)