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Issue: Vol. 669 No. 3: 23 Oct. 2024
Type: Article
Published: 2024-10-23
DOI: 10.11646/phytotaxa.669.3.2
Page range: 194-210
Abstract views: 184
PDF downloaded: 5

Hymenochaete ametzii sp. nov. (Hymenochaetales, Basidiomycota), an endangered bark-dwelling species inhabiting old Quercus pyrenaica trees from the Iberian Peninsula

Department of Biology and Geology, Physics and Inorganic Chemistry. Rey Juan Carlos University. C/ Tulipán s/n, CP 28933 Móstoles, Madrid, Spain. Aranzadi Society of Sciences, Mycology section. Zorroagagaina 11. P.C. 200014. Donostia-San Sebastián, Basque Country, Spain.
Department of Biology and Geology, Physics and Inorganic Chemistry. Rey Juan Carlos University. C/ Tulipán s/n, CP 28933 Móstoles, Madrid, Spain.
Department of Botany and Plant Physiology. Plant DNA-Biobank. Faculty of Biology, University of Salamanca. C/ Licenciado Méndez Nieto s/n, CP 37007 Salamanca, España.
Conservatoire et Jardin Botaniques de Genève. Chemin de l’Impératrice 1, CP 1292, Chambésy-Geneva, Switzerland.
Department of Plant Biology and Ecology (Botany). University of the Basque Country (UPV/EHU), Apdo 644, CP 48080 Bilbao, Spain.
Fungal Conservation IUCN ancient trees Pyrenean oak bark-inhabiting 1 new taxon Fungi

Abstract

Bark-dwelling fungi represent a group of ecologically highly specialized organisms. This study deals with an undescribed species of Hymenochaete characterized by specifically inhabiting the bark of Pyrenean oak (Quercus pyrenaica), and producing effuse-reflexed basidiomata and mainly globose to subglobose basidiospores. Maximum Likelihood and Bayesian analyses of the nuclear ITS-LSU regions revealed that the sequences of H. ametzii form a monophyletic group with a low intraspecific variation and substantially different from closest taxa, further supporting its recognition as a species. The seven localities H. ametzii is known from are old forests with a long ecological continuity, containing large old Q. pyrenaica trees, and are located in the supramediterranean belt of the Mediterranean biogeographical region. Based on habitat availability and field counts of colonized trees, the global population of H. ametzii is estimated at 8,670 mature individuals. Considering that the traditional use of old Q. pyrenaica stands ceased several decades ago in the Iberian Peninsula, with a consequent decline in habitat quality and availability, it is concluded that H. ametzii is Endangered (EN) according to the IUCN criteria.

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