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Issue: Vol. 663 No. 5: 29 Aug. 2024
Type: Article
Published: 2024-08-29
DOI: 10.11646/phytotaxa.663.5.1
Page range: 247-266
Abstract views: 151
PDF downloaded: 11

Cortinarius (Basidiomycota, Cortinariaceae) section Crassispori revisited: resolving the C. chevassutii complex and demystifying C. variebulbus

Via G. Canestrini 10/B, I-38028 Novella, TN, Italy
Via XXV Aprile 76, 20051 Cassina de’ Pecchi, MI, Italy
GLOBE Institute, Section for Geogenetics, University of Copenhagen, Copenhagen, Denmark
203, montée Saint-Mamert-le-Haut, F-38138 Les Côtes-d’Arey
Burgstraße 25, D-29553 Bienenbüttel, Germany
Norwegian Institute for Nature Research (NINA), Sognsvegen 68, 0855 Oslo, Norway
Department of Plant Anatomy, Institute of Biology, Eötvös Loránd University, Pázmány Péter sétány 1/c, H-1117 Budapest, Hungary
Via Sabbioni 13, 38123 Povo, TN, Italy
CEFE, CNRS, Univ Montpellier, EPHE, IRD, INSERM, Montpellier, France
Phylogeny Taxonomy Telamonia Fungi

Abstract

Numerous collections made in deciduous and evergreen oak woodlands of Europe allowed us to re-evaluate, both morphologically and molecularly, the systematic position and taxonomic boundaries of Cortinarius chevassutii f. personatus. This infraspecific taxon and Cortinarius chevassutii share the same ecological niche, an identical distribution pattern, and can even co-occur in the same spot, making their distinction quite challenging, morphologically. However, the phylogenetic analysis of our broad dataset supports two reproductively isolated taxa that both deserve the rank of species. According to recent findings, Cortinarius pseudobulliardioides is the name to apply to the former C. chevassutii f. personatus. Based on present knowledge, spore size and average length/width ratio represents the most reliable diagnostic criterion to separate the two species. Additionally, through next generation sequencing (Illumina) of its holotype, we here reveal the phylogenetic position of Cortinarius variebulbus within the same sect. Crassispori. Recent phylogenetically confirmed collections of this species allow us to document and illustrate this taxon for the first time.

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