A new species of Stigmatodiscus (Ascomycota, Dothideomycetes, Stigmatodiscaceae) from Juan de Nova (Mozambique Channel, Scattered Islands, French Southern and Antarctic Lands)
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UMS 2006 PatriNat (OFB – CNRS – MNHN), Muséum national d’Histoire naturelle, Maison Buffon, CP41, 36 rue Geoffroy Saint-Hilaire 75005 Paris, France
University of Vienna, Department of Botany and Biodiversity Research, Rennweg 14, 1030 Wien, Austria
Muséum national d’Histoire naturelle, Direction des collections, CP39, 57 rue Cuvier, 75231 Cedex 05 Paris, France
Online publication date: 2022-12-09
Publication date: 2022-12-09
Plant and Fungal Systematics 2022; 67(2): 55–62
Stigmatodiscus touroultii (Stigmatodiscaceae, Stigmatodiscales) is described and illustrated from corticated dead twigs of Salvadora angustifolia collected in Juan de Nova (Scattered Islands, Mozambique Channel). It is characterized by the irregularly shaped pruinose hymenial disc without distinct black marginal lips and a calcium oxalate crystal layer in the epithecium. Phylogenetic analyses of a multigene matrix containing a representative selection of Dothideomycetes from four genes (nucSSU-ITS-LSU rDNA, RPB2, TEF1 and TUB2) revealed a highly supported placement within Stigmatodiscus as sister species to Stigmatodiscus oculatus. Micromorphology of the sexual and asexual morph matches the genus Stigmatodiscus. A key to all known species worldwide is provided.
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