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Type: Article
Published: 2020-04-20
Page range: 186–198
Abstract views: 16
PDF downloaded: 1

Revision of the genus Reddellomyces (Tuberaceae): a combination of molecular and morphological analysis provides insights into species diversity

Institut des Régions Arides de Médenine, Université de Gabes, 4119 Médenine, Tunisia
School of Biology, Newcastle University, Newcastle upon Tyne NE1 7RU, UK
School of Environmental and Forest Sciences, University of Washington, Box 352100, Seattle, WA 98195-2100
Institut des Régions Arides de Médenine, Université de Gabes, 4119 Médenine, Tunisia.
Unité bactériologie Moléculaire & Génomique, Institut National des Sciences Appliquées et de Technologie, Université de Carthage, Centre Urbain Nord, Tunis, Tunisia
Reddellomyces Mediterranean-type climate molecular phylogeny taxonomy Tuberaceae Fungi


The Australian genus Reddellomyces comprises several closely related symbiotic ascomycetes with chambered gleba (solid ptychothecium), ornamented ascospores and cylindrical paraphyses that are sometimes difficult to identify based on morphological aspects. Several Reddellomyces species are spread with their Australian host plants (Eucalyptus and Acacia) worldwide including Mediterranean areas. Specimens of an unusual truffle were collected from Acacia saligna stands in Tunisian semi-arid lands and eucalypt forest of Antalya (Turkey) dominated by E. camaldulensis Dehnh. and E. grandis W. Hill. Based on morphological features, these fungi are affiliated to Reddellomyces genus, differing from other species of the genus mainly based on ascospore size. Further analysis based on nuclear rDNA LSU and ITS and digital RFLP of the ITS sequenced amplicons with selected restriction endonucleases showed the unique identity of Tunisian specimens within the genus Reddellomyces. Our results showed also that at least six Reddellomyces species are present including two unnamed species restricted to Australia.