Abstract
An undetermined saprobic fungal taxon from Yunnan (China) is revealed as a new genus in Scortechiniaceae (Coronophorales). The novel taxon, Yuxiensis, is characterized by immersed to erumpent, semi-globose ascomata, which are not surrounded by any tomentum or conspicuous subiculum, a subcylindrical quellkörper in the centrum, clavate asci with long pedicels and allantoid hyaline ascospores with granular contents. Maximum likelihood and Bayesian posterior probability analyses based on LSU, ITS, tef1 and rpb2 sequence data depict a close phylogenetic relationship of the new genus to Pseudocatenomycopsis, hence, confirming its placement in Scortechiniaceae. Parasympodiellaceae, thus far belonging to Parasympodiellales, is transferred to Coronophorales based on multi-gene phylogenetic evidence. Additionally, the incertae sedis monotypic genus Arthrocristula is treated as a synonym of Parasympodiella, with Arthrocristula hyphenata recombined as Parasympodiella hyphenata comb. nov., as the type strain of Arthrocristula hyphenata clusters inside the Parasympodiellaceae clade along with other Parasympodiella taxa.
Highlights
Members of Coronophorales are generally found in terrestrial habitats
All genera formed a well-supported clade in a multi-gene phylogeny based on LSU, tef1 and rpb2 sequence data [9]
The present study aims to introduce a new fungal genus, Yuxiensis, in Scortechiniaceae, collected on a woody host in Yuxi (Yunnan, China) based on morphology and phylogenetic analyses of combined LSU–ITS–tef1–rpb2 sequence data
Summary
Members of Coronophorales are generally found in terrestrial habitats These fungi occur as saprobes on woody substrates, with no specific host per se, and their diversity spans tropical and temperate regions [1,2,3,4]. Scortechiniaceae was introduced by Huhndorf et al [9] to accommodate three saprobic genera, Euacanthe, Neofracchiaea and Scortechinia using morphological characteristics and LSU sequence data. All genera formed a well-supported clade in a multi-gene phylogeny based on LSU, tef and rpb sequence data [9]. All these taxa contain a distinctive phenotypic character in their centrum, namely, the quellkörper, which demarcates them from taxa belonging to other families in the order [2,9]. The quellkörper has, over the years, been considered and justified by taxonomists as the primary family-level character [2,3,9]
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