Abstract
Recent phylogenetic studies indicate taxonomic uncertainty of some species in the genera Arcyria (Arcyriaceae) and Trichia (Trichiaceae). For example, a phylogenetic position of Trichia brunnea still is not resolved. We revised a taxonomic position of this species based on extensively sampled 18S nrDNA sequences, as well as a morphological analysis of sporocarps and spores. The nomenclatural history of T. brunnea is briefly presented and acomprehensive morphological description of the species is provided. In result, we support the transfer of T.brunnea to Arcyria. Because of the name Arcyria brunnea exists already, we propose a new name, A. brunneo-iridescens (= Trichia brunnea).
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