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Naming and describing the diversity in the Usnea cornuta aggregate (lichenized Ascomycota, Parmeliaceae) focusing on Brazilian specimens / Alice Gerlach in Plant and Fungal Systematics, vol. 65, n°2 (Année 2020)  

Public [article]  inPlant and Fungal Systematics > vol. 65, n°2 (Année 2020) . - pp. 272-302 Titre : Naming and describing the diversity in the Usnea cornuta aggregate (lichenized Ascomycota, Parmeliaceae) focusing on Brazilian specimens Type de document : texte imprimé Auteurs : Alice Gerlach, Auteur ; Rosa Mara Borges da Silveira, Auteur ; Carlos Rojas, Auteur ; Philippe Clerc, Auteur Année de publication : 2020 Article en page(s) : pp. 272-302 Langues : Anglais (eng) Catégories : [ZG] Amérique centrale [ZG] Amérique du sud [ZG] Brésil [ZG] Europe [Thèmes] Clé de détermination [Thèmes] Lichens Mots-clés : systématique  Usnea cornuta  Usnea flabelliformis  Usnea rubropallens  Usnea stipitata  Usnea tenuicorticata  Usnea brasiliensis  Usnea macaronesica  Usnea subpectinata  Usnea trachyclada  The multispecies coalescent (MSC)  comparaison d'espèce  aire de répartition Résumé : "This study is a reassessment of the Usnea cornuta aggregate diversity mainly in Brazil. Based on previous multi-locus species delimitation analyses using the multispecies coalescent model (MSC), we carried out a posteriori morphological and anatomical studies. The following corticolous new species are described: Usnea arianae with norstictic or fatty or lobaric acids, convex and efflorescent soralia and a lax medulla; U. flabelliformis with protocetraric acid, fan-shaped main branches and a high medulla/cortex ratio; U. rubropallens with protocetraric acid and a faint orange cortical/subcortical pigment; U. stipitata with constictic acid, stipitate soralia and a high medulla/cortex ratio; and U. tenuicorticata with protocetraric acid, a thin cortex and a high medulla/cortex ratio. The newly described species were found to occur so far only in the Americas, except U. arianae which shows an amphi-atlantic distribution in Europe and on the American continent. Seven species already described belonging to the U. cornuta aggr. in Brazil are further treated here: Usnea boomiana with caperatic acid and large, concave soralia, new to South America; U. brasiliensis with protocetraric acid, minute and irregular soralia; U. cornuta with mainly salazinic acid and minute soralia fusing into consoralia; U. macaronesica (syn. nov.: U. subglabrata) with barbatic acid, large excavate soralia and a lax medulla; Usnea subpectinata, a so far european species resurrected from the U. cornuta synonymy, with stictic acid and numerous isidiofibrils, new to South America; and U. trachyclada with thamnolic acid and K+ bright yellow stipitate soralia. Full descriptions with morphological, anatomical and chemical features, geographical distributions, and illustrations are provided for each species along with an identification key." (source : auteurs) Type de publication : périodique Référence biblio : Gerlach A., Borges da Silveira R., Rojas C., Clerc P., 2020 - Naming and describing the diversity in the Usnea cornuta aggregate (lichenized Ascomycota, Parmeliaceae) focusing on Brazilian specimens. Plant and Fungal Systematics, 65 (2) : 272-302. ID PMB : 71522 DOI : 10.35535/pfsyst-2020-0024 En ligne : https://pfsyst.botany.pl/Naming-and-describing-the-diversity-in-the-Usnea-cornut [...] Format de la ressource électronique : document Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=71522 [article]

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