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The monographer AH Magnusson considered Acarospora fusca to be a member of the morphologically defined A. smaragdula group, most of whose members are now recognized in the phylogenetically circumscribed genus Myriospora. Recently A. fusca has been considered a synonym of M. rufescens. This study presents newly generated ITS, mtSSU and LSU sequences from the neotype of A. fusca that show the species does not match M. rufescens or Myriospora. Instead, the data support that A. fusca belongs to Acarospora and Magnusson’s interpretation that A. fusca is distinct from M. rufescens. The newly generated sequences of A. fusca were identical to those generated from two specimens identified as A. anomala and collected on a wood fence in Sweden.