Asproinocybaceae fam. nov. (Agaricales, Agaricomycetes) for Accommodating the Genera Asproinocybe and Tricholosporum, and Description of Asproinocybe sinensis and Tricholosporum guangxiense sp. nov.

Guang-Fu Mou,Tolgor Bau

doi:10.3390/jof7121086

Abstract

Asproinocybe and Tricholosporum are not well known, and their placement at the family level remains undetermined. In this study, we conducted molecular phylogenetic analyses based on nuc rDNA internal transcribed spacer region (ITS) and nuc 28S rDNA (nrLSU), and a dataset with six molecular markers (ITS, LSU, RNA polymerase II largest subunit (RPB1), RNA polymerase II second largest subunit (RPB2), 18S nuclear small subunit ribosomal DNA (nrSSU), and translation elongation factor 1-alpha (TEF1-α)) using Bayesian (BA) and Maximum Likelihood (ML) methods, we found that the species of Asproinocybe and Tricholosporum formed an independent family-level clade (0.98/72). Asproinocybaceae fam. nov., a new family, is established here for accommodating this clade. Two new species, Asproinocybe sinensis and Tricholosporum guangxiense, from subtropical and tropical karst areas of China, are also described here.

Highlights

The best trees obtained from the Bayesian inference (BI) and Maximum likelihood (ML) analyses with bootstrap values for Bayesian posterior probabilities (BPP) and BS are shown in Figures 1 and 2
The phylogenetic placement of the Asproinocybe/Tricholosporum clade has been discussed by Angelini et al and Lebel et al [6,20] but remains unresolved due to the poor sequencing of the species from this clade
Vizzini et al explained that this difference in arrangement is due to the taxon sampling within Catathelasma, Callistosporium, and Macrocybe [38]

Summary

Introduction

Heim (1970) and Tricholosporum Guzmán (1975) are usually placed in Tricholomataceae due to their tricholomatoid basidioma [1,2,3,4,5,6]. Asproinocybe was originally described as Leucinocybe Heim (1969) and typified by Leucinocybe lactifera Heim (1969) [7]. Leucinocybe is mainly characterized by indigo or violet basidiomata, hyaline and tuberculous spores, and the presence of laticifers [7]. Heim (1970) proposed the new name Asproinocybe, typified by Asproinocybe lactifera [8]. The genus is characterized by tricholomatoid; distinctive purplish, violaceous, or lilac-vinaceous basidioma; lamellae bruising reddish when damaged; spore hyaline and with irregularly tubercle; with laticifers present [6,7,8,9]

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