Présentation d'une nouvelle espèce de Periconia Tode (Periconiaceae) et de son hôte récemment identifié en Chine. Une nouvelle espèce, Periconia neroscuroinea M.B. Khan & T.C. Wen, sp. nov., est décrite à partir des montagnes de Gaoligong, dans la province du Yunnan (Chine), sur la base de caractéristiques morphologiques et de données de séquences d'ADN. Elle a été isolée à partir de feuilles mortes de Ligustrum lucidum W.T. Aiton et se caractérise par des colonies de surface noires et velues sur un substrat naturel, ainsi que par de grands conidiophores et de grosses conidies. Une analyse phylogénétique multigénique des séquences concaténées de LSU, SSU, ITS et TEF-1α a permis d'identifier P. neroscuroinea M.B. Khan & T.C. Wen, sp. nov., comme une lignée phylogénétiquement distincte. La combinaison des preuves morphologiques et moléculaires appuie fortement la reconnaissance de P. neroscuroinea M.B. Khan & T.C. Wen, sp. nov., comme une nouvelle espèce.
A new species of Nothocybe Matheny & K.P.D. Latha, N. vanadurgae Manim. & K.P.D. Latha, sp. nov., is described from Kerala State, India, based on morphology and molecular phylogeny. The diagnostic characters of this species include small basidiocarps with a fibrillose-squamulose pileus, a fibrillose-pruinose stipe with a marginate-bulbous base, smooth basidiospores occasionally with a slight angularity, a sterile lamella-edge with cheilocystidia occasionally with a resinous substance at the apex and copious caulocystidia with a resinous coating at the apex. A phylogenetic analysis based on a concatenated dataset of nrITS, nrLSU and rpb2 confirmed the taxonomic position of this species within the genus Nothocybe of the family Inocybaceae. A comprehensive description of this species, photographs and line drawings of the basidiocarps and the microscopic structures, a detailed discussion and a phylogram showing its position within the genus Nothocybe, are provided.
The distinctive features of alpine ecosystems, along with complex evolutionary and migration patterns, contribute significantly to the remarkable species richness found within these environments. This study aimed to investigate the environmental effects of elevation and microsite characteristics on the diversity and community structure of saxicolous lichens in mountain ecosystems. We also explored the hypothesis that lichen species may migrate to more sheltered microsites in response to climate change. We surveyed 406 plots across seven elevation levels (900 to 2700 m a.s.l.), documenting saxicolous lichen species richness and community composition. Microsite factors such as rock aspect, inclination, and sun exposure were recorded. Statistical analyses included generalized linear mixed models (GLMMs) for richness and community weighted mean trait (CWM) by growth form, as well as multivariate analyses (CCA and NMS) to assess the influence of environmental variables on lichen community composition. We identified 195 lichen species, with significantly lower richness at 900 m a.s.l. compared to higher elevations. Richness was also greater on steep and south-facing rocks. Crustose CWM varied significantly with rock aspect, while foliose and fruticose CWMs were influenced by rock inclination. Multivariate analyses indicated that elevation, rock inclination, rock aspect, and sun exposure significantly shaped the community structure. The study highlights the combined influence of macro-and micro-environmental factors on lichen diversity. Crustose species tolerate harsher conditions, while foliose and fruticose lichens prefer steeper, south-facing microsites. These findings underscore the importance of considering both scales of environmental variation when analyzing the assembly and biodiversity of lichen communities, especially under scenarios of climate change.
Leucocoprinus beninensis Sarawi, sp. nov., is described here as a new species from Benin, West Africa, based on morphological and phylogenetic investigation. Leucocoprinus beninensis Sarawi, sp. nov., differs from known species of Leucocoprinus Pat. and closely related species of Leucoagaricus (Locq. Ex) Singer by the combination of basidiomata with reddish brown, light brown to brown squamules on a white background, a change of colour of the basidiomata to blue-green or grey-blue when dried, the absence of cheilocystidia, and small amygdaliform to ellipsoid basidiospores. Molecular phylogenetic analyses of the nrDNA ITS region reveal that sequences of Lc. beninensis Sarawi, sp. nov., cluster with sequences of Lc. cf. caerulescens (Peck) J.F. Liang, Zhu L. Yang & J. Xu, Lc. cinnamomeodiscus Asif, Saba & M. Raza, Lc. irinellus (Chalange) Kun L. Yang, Jia Y. Lin & Zhu L. Yang, Lc. sericifer (Locq.) Asif, Saba & Uellinga, and Lc. viriditinctus (Berk. & Broome) Asif, Saba & Uellinga.
Podospora anserina (Rabenh.) Niessl is a model fungus that was shown to belong to a complex of seven species with morphologically indistinguishable sexual fruiting bodies. Through the morphological analyses and ITS (Intergenic Transcribed Spacer) sequences of 86 newly-isolated strains, as well as the genome sequences of five strains, we show that members of the P. anserina species complex present different distribution ranges in metropolitan and overseas France. Podospora anserina is present all-over metropolitan France, including Corsica, while P. comata Milovtz. is restricted to the Northern part and P. pauciseta (Ces.) Traverso to the Southern part of continental France. The Guadeloupe hosts P. pseudoanserina C.Boucher, T.S.Nguyen & P.Silar and La R & eacute;union island a species new to science, described here as Podospora reunionensis Silar, sp. nov. This species is closely related to P. comata, but exhibit clear morphological and biological differences.
