Agaricus murinocephalus is described and illustrated as a new species. This taxon, presently known only from Thailand, is characterized by a context that generally does not discolor on exposure, the lack of a phenolic odor, a cap covered by very fine, appressed, dark grey squamules outside the grey disc on a whitish background, and a broken collar-like annulus. Agaricus endoxanthus, previously reported from South America, Europe, and Asia, is recorded for the first time in Thailand. Morphological and published molecular analyses place both taxa in A. sect. Xanthodermatei based on.
DOI:
https://doi.org/10.5248/122.187
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