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

Abstract

A new poroid genus with two conspicuous and common species growing on living Fabaceae trees is described from the Seasonally 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 layer while the context remains monomitic, and by the ellipsoid, thick-walled, adaxially flattened, yellow basidiospores that turn chestnut brown in KOH solution. Molecular and morphological studies of Brazilian specimens macroscopically similar to the 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 and described. Phylogenetically, Phellinotus is closely related to Arambarria, Inocutis, Fomitiporella and other taxonomically unresolved terminal clades, and unrelated to Fulvifomes and Phylloporia. Phellinotus and other genera of poroid Hymenochaetaceae that lack setae or setal hyphae and produce thick-walled, colored (pale yellow to rusty brown) basidiospores form a phylogenetic group here named the ‘phellinotus clade’. Our results indicate the need to include taxa from unexplored areas in order to get a thorough understanding of the phylogeny of the Hymenochaetaceae.

Morphological reassessment and molecular phylogenetic analyses of Amauroderma s.lat. raised new perspectives in the generic classification of the Ganodermataceae family

“…in previous studies carried out by Gomes-Silva et al (2015) and Costa-Rezende et al (2016) , supporting our proposition. Furthermore, hyphal system structure has been considered as a character to support the proposition of new genera among Agaricomycetes, especially polypores, such as in Perenniporiella , Yuchengia, Sanghuangporus , Tropicoporus and Phellinotus ( Decock & Ryvarden 2003 , Robledo et al 2009 , Zhao et al 2013 , Zhou et al 2015 , Drechsler-Santos et al 2016 ).…”

Arambarria the pathogen involved in canker rot of Eucalyptus, native trees wood rots and grapevine diseases in the Southern Hemisphere

“…(), Parmasto, Saar, Larsson, and Rummo (), Zhou and Dai (), Zhou () and Drechsler‐Santos et al. () based on morphological and molecular characteristics, and accepted in the Hymenochateaceae. Whenever possible, sequences of the generic type species were included.…”

First record of Daedalea ryvardeniana Drechsler-Santos & Robledo (Agaricomycetes, Polyporales, Fomitopsidaceae) in the Caatinga area of Bahia, Brazil

“…According to Giulietti et al (2004Giulietti et al ( , 2005, this domain is one of the greatest biological patrimonies in Brazil, bringing together an expressive number of rare and endemic taxa with ecological, cultural, and economic importance. Drechsler-Santos et al (2010), Gibertoni et al (2011), Baltazar et al (2012, Drechsler-Santos et al (2012a, b), Neves et al (2013), Drechsler-Santos et al (2013), Maia et al (2015), and Drechsler-Santos et al (2016) reported the occurrence of new polyporoid fungi taxa in some Caatinga regions.…”