Agaricus section Brunneopicti: a phylogenetic reconstruction with descriptions of four new taxa

• DOI: 10.11646/phytotaxa.192.3.2
• Publication Date: 2015-01-13T23:37:57Z
• Authors: Jie Chen; Ruilin Zhao; Luis A Parra; Atsu K Guelly; André De Kesel; Sylvie Rapior; Kevin D Hyde; Ekachai Chukeatirote; Philippe Callac
• Keywords: Agaricus; Agaricales; Stipe (mycology); Identification key

Agaricus is a genus of saprobic basidiomycetes including species nutritional and medicinal interest. Historically the temperate have been grouped into eight classical sections. Recent phylogenetic analyses however, revealed that two-thirds tropical taxa do not cluster in these sections, but form exclusively clades. Seven (TR I to TR VII) strongly supported clades it was hypothesized clade might represent section Brunneopicti. This initially characterized by presence punctiform squamules, remains veil, on pileus stipe. The present morphological study ML, MP Bayesian based ITS1+2 sequences show corresponds Brunneopicti includes 16 four subclades two isolated branches. six with squamules which constitute one subclades. We propose new replacement name brunneopunctatus for illegitimate brunneopictus. All are discussed, full descriptions provided five, among them, A. brunneosquamulosus, niveogranulatus, sordidocarpus toluenolens described as species. also report certain members traits generally characterize belonging other These shared characters raise issue their origin complicate systematics identification An artificial dichotomous key presented identification. Section first reconstructed Agaricus. Its known geographical distribution range strictly palaeotropical. predict richness somewhat forgotten or sections will increase coming years.