Ronald H. Petersen Livres

This volume summarizes the taxonomic and phylogenetic knowledge of a small group of fungal, mushroom genera (Homobasidiomycota, Agaricales) centered in Xerula s. l. and Oudemansiella. The work is partitioned into several parts: introductory material including the published history of the group; application of DNA sequencing and phylogenetics to the involved taxa; world monographs of the included genera; and studies of type specimens linked to implicated taxa. Sixtyeight new taxa and / or new combinations are proposed, including four new genera (Hymenopellis, Paraxerula, Pointiculomyces, Protoxerula), and other genera are resurrected/reconfigured (Dactylosporina, Mucidula, Oudemansiella, Xerula). The descriptive text is supplemented with copious line drawings, phylogenetic trees and 31 color plates. Combining, as it does, traditional morphotaxonomy, monography, molecular applications and thorough type specimen descriptions, this volume is intended for workers in these fields, especially those interested in agaric groups. It will serve as an active monographic source as well as a reference to many taxonomic names both in and out of the targeted complex.

This volume presents three comprehensive papers on the mushroom genus Lentinellus KARSTEN, known for its rich diversity in Europe and North America. It covers taxonomy, morphology, biogeography, and phylogeny based on ribosomal sequences, summarizing findings from worldwide collections. A total of twenty-four species are accepted, with discussions on nomina incertae sedis, Species Rejicienda, type specimens, and typification issues. Notably, one species (L. castoreus) is reported as cosmopolitan, while two are circum-North Temperate (L. micheneri, L. ursinus) and two are Gondwanan (L. novae-zelandiae, L. pulvinulus); the remaining species have restricted distributions. The examination of type specimens, both macro- and micromorphologically, contributes to stabilizing nomenclature and accurately categorizing specimens within their taxa. A phylogenetic reconstruction based on ribosomal ITS1-5.8S-ITS2 DNA sequences identifies several infrageneric clades, with distinct separation of some species (e.g., L. ursinus, L. castoreus). Others, separable by morphological or sexual traits, are grouped (e.g., L. micheneri, L. subaustralis). The volume also details robust phylogenies for L. castoreus and L. ursinus, exploring their potential origins. Enhanced by thirteen color plates, it emphasizes key aspects of nomenclature, morphology, taxonomy, and phylogeny.