Abstract
Smithiomyces Singer is a rare genus in the family Agaricaceae, previously known from the Neotropics and tropical Asia. Based on morphological observation and phylogenetic analyses of four nuclear loci (ITS, LSU, rpb2, and tef1-α), we describe Smithiomyces umbonatus sp. nov. from Anhui Province, China. The new species is characterized by a slightly prominent pileal umbo, conspicuous white rhizomorphs at the stipe base, and both 2- and 4-spored basidia. A full morphological description, field photographs, and line drawings of the microcharacters are provided.
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