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. 2022 Mar 30:88:55-78.
doi: 10.3897/mycokeys.88.73951. eCollection 2022.

 Hemiaustroboletus, a new genus in the subfamily Austroboletoideae (Boletaceae, Boletales)

Olivia Ayala-Vásquez  1 , Jesús García-Jiménez  1 , Elvira Aguirre-Acosta  2 , Rigoberto Castro-Rivera  3 , Rodolfo Enrique Ángeles-Argáiz  2 , Ángel Emmanuel Saldivar  4 , Roberto Garibay-Orijel  2
Affiliations

 Hemiaustroboletus, a new genus in the subfamily Austroboletoideae (Boletaceae, Boletales)

Olivia Ayala-Vásquez et al. MycoKeys. .

Abstract

The present study describes Hemiaustroboletus gen. nov. in the subfamily Austroboletoideae (Boletaceae). Hemiaustroboletus is supported by morphological and molecular data using LSU and RPB2 regions. Additionally, its geographic distribution and intraspecific variation were inferred using ITS sequences. The genus is characterised by pileate-stipitate basidiomata; purple, brown, reddish-brown, orange-brown to dark brown vinaceous pileus; whitish or lilac to vinaceous context and a subclavate stipe. Microscopically, it is characterised by ornamented, slightly verrucose, cracked to perforated brown basidiospores. Two species are described within the genus, Hemiaustroboletusvinaceobrunneus sp. nov. and H.vinaceus sp. nov. Hemiaustroboletusvinaceus sp. nov. is morphologically similar to Austroboletusgracilis, which suggests they may have been confused in the past. This study presents the phylogenetic placement, microscopic structures, detailed morphological descriptions and illustrations of both new species.

Keywords: Mexico; mycodiversity; neotropics; new taxa.

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Figures

Figure 1.
Figure 1.
Phylogenetic placement of Hemiaustroboletus gen. nov. in the Austroboletoideae subfamily (Boletaceae) using LSU and RPB2 markers in a concatenated and partitioned matrix. The tree shows the topology of Bayesian analysis, with both MLB (≥ 70%) and BPP (≥ 0.7) clade support given. New genera and new species are indicated in the rectangles; taxa and/or branches in purple correspond to Hemiaustroboletus gen. nov.; remaining Austroboletoideae (blue); Boletoideae (green); Xerocomoideae (mustard). Background colours correspond to subfamilies; grey bars correspond to families.
Figure 2.
Figure 2.
Phylogenetic tree of Hemiaustroboletus displaying geographic distribution using voucher and environmental ITS nrDNA sequences. The tree shows the topology of Bayesian analysis, with both MLB (≥ 70%) and BPP (≥ 0.7) clade support given. Taxa and branches in purple correspond to Hemiaustroboletus gen. nov. and those in blue to Veloporphyrellus and Austroboletus.
Figure 3.
Figure 3.
HemiaustroboletusvinaceobrunneusA, C basidiomata (MEXU-30052 Holotype) B, D pileus (MEXU-30053, MEXU-30051, Isotype) E hymenophore (MEXU-30052 Holotype) F, G context (MEXU-30052 Holotype). Scale bar: 10 mm (A–G).
Figure 4.
Figure 4.
Hemiaustroboletusvinaceobrunneus (AV845-ITCV, MEXU-30052 Holotype) A basidiospores B basidia C pleurocystidia D cheilocystidia E pileipellis F caulocystidia. Scale bars: 10 µm (A–F).
Figure 5.
Figure 5.
Basidiospore ornamentation of Hemiaustroboletus revealed by SEMA, CHemiaustroboletusvinaceus (AV868-ITCV, MEXU-30051, Holotype) B, DHemiaustroboletusvinaceobrunneus (AV1168-ITCV, MEXU-30053 Isotype).
Figure 6.
Figure 6.
Hemiaustroboletusvinaceus (AES334-IBUG, Holotype) A, B basidiomata C hymenophore D context E pileus surface. Scale bar: 10 mm (A–E).
Figure 7.
Figure 7.
Hemiaustroboletusvinaceus (AES334-IBUG, Holotype) A basidiospores B basidia C pleurocystidia D cheilocystidia E pileipellis F caulocystidia. Scale bars: 10 µm (A–F).
See this image and copyright information in PMC

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