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Issue: Vol. 607 No. 1: 3 Aug. 2023
Type: Article
Published: 2023-08-03
DOI: 10.11646/phytotaxa.607.1.4
Page range: 41-56
Abstract views: 229
PDF downloaded: 14

Two new species of resupinate poroid fungi (Basidiomycota, Polyporaceae) from São Tomé and Príncipe Archipelago

University of Lisboa, National Museum of Natural History and Science / Centre for Ecology, Evolution and Environmental Changes, Natural History and Sistematics (NHS) Research Group (cE3c), Lisboa, Portugal.
Department of Vegetal Biology and Ecology, Faculty of Science and Technology, University of Basque Country, UPV/EHU, Leioa, Bizkaia, Spain.
University of Lisboa, National Museum of Natural History and Science / Centre for Ecology, Evolution and Environmental Changes, Natural History and Sistematics (NHS) Research Group (cE3c), Lisboa, Portugal.
Department of Biology and Geology, Physics and Inorganic Chemistry, University Rey Juan Carlos, Móstoles, Madrid, Spain.
Fungi Equatorial Africa Grammothele Gulf of Guinea Megasporia Molecular phylogeny Porogramme Taxonomy

Abstract

Megasporia insularis and Porogramme principes are described as new species based on morphological and molecular data of specimens collected on the Island of Príncipe (São Tomé and Príncipe Archipelago). Megasporia insularis is characterized by the hymenophore with large regular pores, a di-trimitic hyphal system with strongly dextrinoid skeletal hyphae, apically acuminate hyphal endings at the dissepiments edges, presence of dendrohyphidia, and large, subcylindrical basidiospores. Our phylogenetic analyses of the ITS-nLSU-mtSSU-RPB1-RPB2-TEF regions support the placement of M. insularis within an inclusive clade containing the redefined Megasporia. Porogramme principes has small irregular pores, a dimitic hyphal system with weakly dextrinoid skeletal hyphae, and small, oblong-ellipsoid basidiospores. The phylogenetic analyses of Porogramme and related genera place P. principes, together Grammothele taiwanensis, in a supported clade sister to P. subargentea, and separate from the species clade Grammothele s.str. Therefore, we propose to combine the species G. taiwanensis as Porogramme taiwanensis. Illustrations of these two novel species and updated keys to Megasporia and Porogramme genera are provided.

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