Four new East Asian species of Aleurodiscus with echinulate basidiospores.

Sheng-Hua Wu,Chia-Ling Wei,Yu-Ting Lin,Shuang-Hui He,Chiung-Chih Chang

doi:10.3897/mycokeys.52.34066

Sheng-Hua Wu, Chia-Ling Wei + Show 3 more

Open Access

https://doi.org/10.3897/mycokeys.52.34066

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Abstract

Four new species of Aleurodiscus sensu lato with echinulate basidiospores are described from East Asia: A.alpinus, A.pinicola, A.senticosus, and A.sichuanensis. Aleurodiscusalpinus is from northwest Yunnan of China where it occurs on Rhododendron in montane habitats. Aleurodiscuspinicola occurs on Pinus in montane settings in Taiwan and northwest Yunnan. Aleurodiscussenticosus is from subtropical Taiwan, where it occurs on angiosperms. Aleurodiscussichuanensis is reported from southwest China on angiosperms in montane environments. Phylogenetic relationships of these four new species were inferred from analyses of a combined dataset consisting of three genetic markers, viz. 28S, nuc rDNA ITS1-5.8S-ITS2 (ITS), and a portion of the translation elongation factor 1-alpha gene, TEF1.

Highlights

IntroductionWhether to keep Aleurodiscus in a broad or a narrow sense has long been a puzzling issue in the taxonomy of Basidiomycota (Boidin et al 1985; Núñez and Ryvarden 1997; Wu et al 2001; Larsson and Larsson 2003; Miller et al 2006; Larsson 2007; Wu et al 2010), because diagnostic characters are highly variable among species
During a two-decade long, ongoing survey of corticioid fungi from mainland China and Taiwan, we have found four new species of Aleurodiscus with echinulate basidiospores based on morphological characters
A fully resolved and robust phylogeny of Aleurodiscus s.l. and related taxa was not achievable with ribosomal genes alone. Dai and He (2016) and our study have addressed this by including translation elongation factor 1-alpha (TEF1) for phylogenetic analyses

Summary

Introduction

Whether to keep Aleurodiscus in a broad or a narrow sense has long been a puzzling issue in the taxonomy of Basidiomycota (Boidin et al 1985; Núñez and Ryvarden 1997; Wu et al 2001; Larsson and Larsson 2003; Miller et al 2006; Larsson 2007; Wu et al 2010), because diagnostic characters are highly variable among species. Since the phylogenetic relationships of the taxa in Aleurodiscus s.l., as well as in the Stereaceae at large, are not resolved, we adopt a broad and inclusive generic concept of Aleurodiscus for the new taxa presented in this study. During a two-decade long, ongoing survey of corticioid fungi from mainland China and Taiwan, we have found four new species of Aleurodiscus with echinulate basidiospores based on morphological characters. Phylogenetic analyses of a nuclear rDNA 28S D1–D2 domains (28S) dataset and analyses of a second dataset consisting of three genetic markers – nuc rDNA 28S D1–D2 domains (28S), nuc rDNA ITS1-5.8S-ITS2 (ITS), and translation elongation factor 1-alpha (TEF1) – are performed to complement our morphological observations and place the newly described species in a molecular phylogenetic framework

Materials and methods

Discussion