Four species of Agaricus subgenus Spissicaules, including a new species A. catenariocystidiosus, are identified from Eastern China based on morphological and molecular data. All of the species are introduced with full descriptions. Phylogenetic relationships were inferred based on the nuclear ribosomal internal transcribed spacer (ITS) region. The known species A. inthanoensis, A. parasubrutilescens and A. planipileus are compared with their original descriptions, and several supplementary morphological characters are provided.
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