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 Add this item to the list  823915 Original description
Remarks (public):In the present study, a new genus, Elaphroporia, is described based on phylogenetic analyses and morphological characters. The genus has unique morphological characters in Meruliaceae. Previously, seven clades were found in the Polyporales: antrodia clade, core polyporoid clade, fragiliporia clade, gelatoporia clade, phlebioid clade, residual polyporoid clade and tyromyces clade (Binder et al 2013, Zhao et al. 2015). According to our result based on the combined ITS+nLSU sequence data (Fig. 1), the new genus is nested into the residual polyporoid clade with strong support (100% BS, 100% BP, 1.00 BPP). Miettinen et al. (2012) analyzed a higher-level phylogenetic classification of the residual polyporoid clade morphological plasticity in a group of the polypores, and showed that the natural genera could mostly be characterized morphologically and poroid and hydnoid species belong to separate genera. The current phylogeny shows that the genus Elaphroporia falls into the residual polyporoid clade and belongs to the family Meruliaceae (Figs. 1, 2). Furthermore, the new genus is closely related to Junghuhnia, and then grouped with Flaviporus and Steccherinum based on ITS+LSU-nrRNA gene regions with a strong support (100% BS, 100% BP, 1.00 BPP; Fig. 1). However, morphologically Junghuhnia differs from Elaphroporia by a dimitic hyphal system and presence of cystidia (Núñez and Ryvarden 2001, Ryvarden and Melo 2014). Flaviporus is separated from Elaphroporia by the dark brown to bay pileus, a dimitic hyphal system and presence of the metuloid cystidia (Murrill 1905). Steccherinum differs in its odontioid to hydnoid hymenophore, and cyanophilous basidiospores (Bernicchia and Gorjón 2010). Morphologically, Elaphroporia resembles Ceriporia Donk and Phlebiporia Jia J. Chen, B.K. Cui & Y.C. Dai. Ceriporia is similar to Elaphroporia in an annual growth habit with poroid hymenophore, a monomitic hyphal structure and hyaline, thin-walled and smooth basidiospores. In addition, both genera cause a white rot. However, Ceriporia differs from Elaphroporia by the generative hyphae IKI–, CB– (Jia et al. 2014). Additionally, in molecular studies, Ceriporia fell into the phlebia clade (Miettinen and Larsson 2011, Miettinen and Rajchenberg 2012, Miettinen et al. 2012, Binder et al. 2013) which is also same to our study (Fig. 1). Phlebiporia is similar to Mellipora by having the poroid hymenophore and the generative hyphae bearing both simple septa and clamp connections, but it is separated from Elaphroporia by having dextrinoid generative hyphae, tissues becoming brownish in KOH and presence of thin-walled quasi-binding hyphae in the subiculum (Chen and Cui 2014). 
Description type:Original description 
Description:Basidiocarps annual, resupinate, becoming rigid and light-weight up on drying. Pore surface cream to pale yellow when fresh, turn to yellow upon drying. Hyphal system monomitic; generative hyphae thick-walled bearing both clamp connections and simple septa, slightly amyloid, CB+. Basidiospores ellipsoid, hyaline, thin-walled, smooth, IKI–, CB–. 
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