RESUMO

Macrolepiota 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.

Assuntos

Agaricales/classificação , Agaricales/genética , Carpóforos/crescimento & desenvolvimento , Filogenia , Agaricales/crescimento & desenvolvimento , Agaricales/isolamento & purificação , Brasil , Análise por Conglomerados , DNA Fúngico/química , DNA Fúngico/genética , DNA Ribossômico/química , DNA Ribossômico/genética , DNA Espaçador Ribossômico/química , DNA Espaçador Ribossômico/genética , Genes de RNAr , Microscopia , Microscopia Eletrônica de Varredura , RNA Polimerase II/genética , RNA Fúngico/genética , RNA Ribossômico 28S/genética , RNA Ribossômico 5,8S/genética , Análise de Sequência de DNA , Esporos Fúngicos/citologia