in Korea: New Records and a New Species.

The genus (Agaricales, Basidiomycota) is easy to recognize at the genus level because of big, fleshy basidiocarps with squamules covering the pileus; a single or double annulus; and big, thick-walled basidiospores with a germ pore. However, morphological identification is often unreliable in due to similar morphological features among species. Due to the uncertainty of previous morphological identification in the genus it is necessary to re-examine Korean using molecular data. We re-examined 34 specimens collected from 2012 to 2018 in Korea using a reverse taxonomic approach, whereby species identification was first done based on the internal transcribed spacer (ITS) region analysis, followed by morphological confirmation. We identified the presence of four species: , . , . , and sp. nov. Two species ( and . ) were previously unrecorded from Korea and is a new species. Detailed descriptions of all four species and taxonomic key are provided in this study. and are distributed through the country, but and are distributed only in limited areas. According to our results, the combination of ITS locus and morphology proved to be a robust approach to evaluate the taxonomic status of species in Korea. Additional surveys are needed to verify the species diversity and clarify their geographic distribution.