Generic concepts and taxonomic uncertainties in the family Meruliaceae (Polyporales, Basidiomycota)

Papp, Viktor and Dima, Bálint (2017) Generic concepts and taxonomic uncertainties in the family Meruliaceae (Polyporales, Basidiomycota). Acta Biologica Plantarum Agriensis, 5 (1). p. 40. ISSN 2061-6716

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Abstract

The most recent phylogenetic studies demonstrated that the phlebioid clade forms three different lineages, which are accepted as Irpicaceae, Meruliaceae and Phanerochaetaceae in family rank. The family name Meruliaceae (= Climacodontaceae, = Phlebiaceae) was proposed by Petter Adolf Karsten in 1881 and published validly by Carleton Rea in 1922, based on Merulius as generic type. The family contains wood-inhabiting white-rot species, which microscopically characterised in general by the monomitic hyphal system with clamp-connections, the smooth, hyaline, thin-walled spores and the presence of cystidia. The annual resupinate basidiocarp form is dominated in the family, with corticioid (e.g. Lilaceophlebia), phlebioid (e.g. Merulius, Phlebia spp.), odontioid (e.g. Crustodontia, Scopuloides), hidnoid (e.g. Climacodon, Hydnophlebia, Mycoacia, Mycoaciella, Sarcodontia) or poroid (e.g. Luteoporia, Phlebiporia) trama. Furthermore, besides the resupinate basidiocarps, the pileate form also occurs in certain poroid genera (e.g. Aurantiopileus, Aurantiporus). Due to the results of the phylogenetic studies on the phlebioid clade, the former generic concepts based on morphological observations had to be revised in some cases. Based on multigene phylogenetic analyses, it seems that certain large genera (e.g. Ceriporia, Ceriporiopsis, Phanerochaete and Phlebia) created by morphological observations are polyphyletic and the species classified in these genera can be found in Meruliaceae as well as in other families within the order Polyporales. Therefore, the correct taxonomic status of many species in the phlebioid clade is uncertain and an extensive molecular sampling is necessary to establish sound generic concepts in the Meruliaceae. In this presentation (i) we aimed to discuss the taxonomic uncertainties and unsolved problems in the family Meruliaceae. Furthermore, based on morphological and phylogenetic perspectives (ii) we aimed to investigate the legitimacy of certain genus names, which formerly placed in the Meruliaceae: e.g. Amaurohydnum; and in addition (iii) we reported the description of a new polypore genus, typified on Aurantiporus alborubescens (≡ Phaeolus alborubescens) evidenced by morphological characteristics and multigene phylogenetic analysis.

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