Abstract
Wood-inhabiting fungi play crucial roles as decomposers in forest ecosystems and, in this study, two new wood-inhabiting corticioid fungi, Hyphodermapuerense and H.tenuissimumspp. nov., are proposed, based on a combination of morphological features and molecular evidence. Hyphodermapuerense is characterised by effused basidiomata with smooth to floccose hymenial surface, a monomitic hyphal system with clamped generative hyphae and ellipsoid basidiospores. Hyphodermatenuissimum is characterised by resupinate basidiomata with tuberculate to minutely-grandinioid hymenial surface, septate cystidia and cylindrical to allantoid basidiospores. Sequences of ITS and nLSU rRNA markers of the studied samples were generated and phylogenetic analyses were performed with Maximum Likelihood, maximum parsimony and Bayesian Inference methods. These analyses showed that the two new species clustered into Hyphoderma, in which H.puerense grouped with H.moniliforme and H.tenuissimum formed a singleton lineage. In addition, an identification key to Chinese Hyphoderma is provided.
Highlights
Fungi are eukaryotic microorganisms that play fundamental ecological roles as decomposers and mutualists of plants and animals
We present morphological and molecular phylogenetic evidence that support the recognition of two new species in Hypho derma, based on the nuclear ribosomal internal transcribed spacer region (ITS1, 5.8S and ITS2) and the nuclear ribosomal nLSU (28S) gene
The two new taxa were found to belong to Hyphoderma, in which H. puerense forms a sister species to H. moniliforme and H. tenuissimum forms an independent monophyletic lineage (100% Branch support (BS), 100% BP and 1.00 Bayesian posterior probability (BPP))
Summary
Fungi are eukaryotic microorganisms that play fundamental ecological roles as decomposers and mutualists of plants and animals. They drive carbon cycling in forest soils, mediate mineral nutrition of plants and alleviate carbon limitations of other soil organisms (Tedersoo et al 2014). Was typified by H. setigerum (Fr.) Donk (Donk 1957) and the genus is characterised by resupinate to effuse-reflexed basidiomata of ceraceous consistency and a smooth to tuberculate or hydnoid hymenophore. Hyphoderma species are characterised by a monomitic (rarely dimitic) hyphal structure with clamp connections on generative hyphae, presence of cystidia or not, suburniform to subcylindrical to cylindrical basidia and ellipsoid to subglobose, smooth, thin-walled basidiospores (Wallroth 1833; Bernicchia and Gorjón 2010). Index Fungorum (http://www.indexfungorum.org; accessed on 16 July 2021) and MycoBank (https://www.mycobank.org; accessed on 16 July 2021) register 199 specific and infraspecific names in Hyphoderma
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