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Abstract
Alessioporus and Pulchroboletus are proposed as new monotypic genera to accommodate the thermo-xerophilic European species Xerocomus ichnusanus and X. roseoalbidus respectively. The present research focused on both morphological features and multigene molecular phylogeny (nrITS, nrLSU, tef-1α datasets) to elucidate the taxonomic status of these two rare Mediterranean boletes and delineate a natural classification within the family Boletaceae. Macro- and microscopic descriptions of the two species based on inclusive taxon sampling are provided and supported by line drawings of the main anatomical features. Phylogenetic relationships, ecology, geographical distribution and delimitation from the most closely allied taxa also are highlighted. In addition, epitype specimens are selected for both species.
Acknowledgments
We thank R. Galli (Milano, Italy) for kindly providing the type of X. ichnusanus, plus additional material including a topotypic collection. We also thank A. Mua (Quartu Sant’Elena, Sardinia, Italy) for supplying recent collections of A. ichnusanus and P. roseoalbidus and G. Consiglio (Casalecchio, Italy) for sending images of a gasteroid specimen of P. roseoalbidus. H. Ladurner (Munich, Germany) kindly provided supplementary microscopic data. V. Migliozzi, L. Perrone and B. Picillo (Rome, Italy) are warmly acknowledged by MG for their companionship in collecting fungi and the former also for providing a dried sample of A. ichnusanus. A special thanks goes to M. Contu (Tempio Pausania, Sardinia, Italy) for his invaluable suggestions on taxonomy and nomenclature. Finally we thank all the collaborators who retrieved material of A. ichnusanus and P. roseoalbidus from all over Italy.