Abstract
ABSTRACTMacrolepiota is a poorly known genus in the Neotropics. In order to increase knowledge about this group, we collected specimens from the Atlantic Forest in southern and northeastern Brazil. Macrolepiota cyanolamellata and M. sabulosa from subtropical and tropical regions, respectively, are proposed as new species. We performed molecular phylogenetic analyses of the nuc rDNA internal transcribed spacer region ITS1-5.8S-ITS2 (ITS) and the combined data set ITS + nuclear large subunit rDNA (28S) + RNA polymerase II second largest (RPB2), as well as morphological analyses. Two lineages with unique morphotypes were found. The species proposed were strongly supported as the sister lineage closely related to M. clelandii and M. subcitrophylla. Detailed descriptions and illustrations of their macro- and microscopic characters are provided.
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