Phellinotus, a new neotropical genus in the Hymenochaetaceae (Basidiomycota, Hymenochaetales)

GERARDO ROBLEDO; RECK, MATEUS ARDUVINO; RAJCHENBERG, M.; DRECHSLER-SANTOS R.E.; LIMA-JUNIOR, NELSON; MALOSSO, E; GIBERTONI, T.; DE QUEIROZ CAVALCANTI, MARIA

Phytotaxa

Magnolia Press

Lugar: Auckland; Año: 2016 vol. 261 p. 218 - 239

1179-3155

A new poroid genus with two conspicuous and common species growing on living Fabaceae trees is described from theSeasonally Dry Tropical Forests biome of Brazil. Both taxa in this forest pathogen genus resemble Phellinus rimosus macroscopically,but are distinguished by a dimitic hyphal system with skeletal hyphae present only in the trama of the tube layerwhile the context remains monomitic, and by the ellipsoid, thick-walled, adaxially flattened, yellow basidiospores that turnchestnut brown in KOH solution. Molecular and morphological studies of Brazilian specimens macroscopically similar tothe Phellinus rimosus species complex were carried out to solve their phylogenetic relationships among the Hymenochaetaceae.Phellinotus gen. nov. with P. neoaridus sp. nov. as the genus type and P. piptadeniae comb. nov. are presented anddescribed. Phylogenetically, Phellinotus is closely related to Arambarria, Inocutis, Fomitiporella and other taxonomicallyunresolved terminal clades, and unrelated to Fulvifomes and Phylloporia. Phellinotus and other genera of poroid Hymenochaetaceaethat lack setae or setal hyphae and produce thick-walled, colored (pale yellow to rusty brown) basidiospores forma phylogenetic group here named the ?phellinotus clade?. Our results indicate the need to include taxa from unexplored areasin order to get a thorough understanding of the phylogeny of the Hymenochaetaceae.