Caribbean islands; Lesser Antilles; lichenized fungi; phylogeny; new species MOTS CLÉS Caraïbes; Petites Antilles; champignons lichénisés; phylogénie; espèce nouvelle View publication stats
Abstract :
[en] An unknown species of Roccellaceae Chevall. was collected in 2022 and 2023 on the bark of trunks in a rainforest in Basse-Terre island (Guadeloupe, Lesser Antilles). Phylogenetic analyses using mtSSU, nuLSU and RPB2 sequences reveal the placement of the species in the genus Mazosia A.Massal. (Roccellaceae). The lichen is unusual for the genus by being the first species of Mazosia developing a byssoid thallus. It is described as Mazosia byssoidea Lebreton & Ertz, sp. nov. Besides it byssoid thallus, the new species is characterized by 1-septate ascospores, stipitate pycnidia and a chemistry with roccellic acid. Together, all these features make the new species a distinctive and important addition to the Arthoniales Henssen ex D.Hawksw. & O.E.Erikss. So far, it is only known from two large trees in a dense humid forest at low elevation, a locality that needs to be included in a protected area. A key to the corticolous species of Mazosia is provided. RÉSUMÉ Une espèce nouvelle corticole de Mazosia A.Massal. (Roccellaceae, Arthoniales) de Guadeloupe, remarquable par son thalle byssoïde. Une espèce inconnue de Roccellaceae Chevall. a été collectée en 2022 et 2023 sur écorce d'arbres dans une forêt tropicale dense et humide sur l'île de la Basse-Terre en Guadeloupe (Petites Antilles). Des analyses phylogénétiques utilisant les séquences mtSSU, nuLSU et RPB2 révèlent le placement de l'espèce dans le genre Mazosia A.Massal. (Roccellaceae). Ce lichen est inhabituel pour le genre car il s'agit de la première espèce de Mazosia développant un thalle byssoïde. Il est décrit comme Mazosia byssoidea Lebreton & Ertz, sp. nov. En plus de son thalle byssoïde, la nouvelle espèce est caractérisée par des ascospores à une cloison, des pycnides pédonculées et une chimie caractérisée par l'acide roccellique. L'ensemble de ces caractéristiques fait de cette nouvelle espèce un ajout singulier et important aux Arthoniales Henssen ex D.Hawksw. & O.E.Erikss. Jusqu'à présent, elle n'est connue que de deux grands arbres dans une forêt dense humide de basse altitude, une localité qui devrait être incluse dans une zone protégée. Une clé des espèces corticoles du genre Mazosia est fournie.
Ertz, Damien; Meise Botanic Garden, Department Research, Nieuwelaan 38, BE-1860 Meise (Belgium) and Fédération Wallonie-Bruxelles, Service général de l'Enseignement supérieur et de la Recherche scientifique, rue A. Lavallée 1, BE-1080 Bruxelles (Belgium)
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