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Thelopsis challenges the generic circumscription in the Gyalectaceae and brings new insights to the taxonomy of Ramonia

Published online by Cambridge University Press:  12 March 2021

Damien Ertz Open the ORCID record for Damien Ertz [Opens in a new window] ,
Neil Sanderson Open the ORCID record for Neil Sanderson [Opens in a new window]  and
Marc Lebouvier Open the ORCID record for Marc Lebouvier [Opens in a new window]
Damien Ertz*
Affiliation:
Meise Botanic Garden, Department Research, Nieuwelaan 38, 1860Meise, Belgium Fédération Wallonie-Bruxelles, Service général de l'Enseignement supérieur et de la Recherche scientifique, Rue A. Lavallée 1, 1080Bruxelles, Belgium
Neil Sanderson
Affiliation:
3 Green Close, Woodlands, Southampton, SO40 7HU, UK
Marc Lebouvier
Affiliation:
Université de Rennes, CNRS, EcoBio (Ecosystèmes, biodiversité, évolution) - UMR 6553, F-35000Rennes, France
*
Author for correspondence: Damien Ertz. E-mail: [email protected]
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Abstract

The genus Thelopsis was classified in the family Stictidaceae but its systematic position has never been investigated by molecular methods. In order to determine its family placement and to test its monophyly, fungal DNA of recent collections of Thelopsis specimens was sequenced. Phylogenetic analyses using nuLSU, RPB2 and mtSSU sequences reveal that members of Thelopsis form a monophyletic group within the genus Gyalecta as currently accepted. The placement of Thelopsis, including the generic type T. rubella, within the genus Gyalecta challenges the generic circumscription of this group because Thelopsis is well recognized by the combination of morphological characters: perithecioid ascomata, well-developed periphysoids, polysporous asci and small, few-septate ellipsoid-oblong ascospores. The sterile sorediate Opegrapha corticola is also placed in the Gyalectaceae as sister species to Thelopsis byssoidea + T. rubella. Ascomata of O. corticola are illustrated for the first time and support its placement in the genus Thelopsis. The hypothesis that O. corticola might represent the sorediate fertile morph of T. rubella is not confirmed because the species is phylogenetically and morphologically distinct. Thelopsis is recovered as polyphyletic, with T. melathelia being placed as sister species to Ramonia. The new combinations Thelopsis corticola (Coppins & P. James) Sanderson & Ertz comb. nov. and Ramonia melathelia (Nyl.) Ertz comb. nov. are introduced and a new species of Gyalecta, G. amsterdamensis Ertz, is described from Amsterdam and Saint-Paul Islands, characterized by a sterile thallus with discrete soralia. Petractis luetkemuelleri and P. nodispora are accommodated in the new genus Neopetractis, differing from the generic type (P. clausa) by having a different phylogenetic position and a different photobiont. Francisrosea bicolor Ertz & Sanderson gen. & sp. nov. is described for a sterile sorediate lichen somewhat similar to Opegrapha corticola but having an isolated phylogenetic position as sister to a clade including Gyalidea praetermissa and the genera Neopetractis and Ramonia. Gyalecta farlowii, G. nidarosiensis and G. carneola are placed in a molecular phylogeny for the first time. The taxonomic significance of morphological characters in Gyalectaceae is discussed.

Keywords

ArthonialesGyalectaleslichenmultisporyphylogeny
Type
Standard Papers
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The Lichenologist , Volume 53 , Issue 1 , January 2021 , pp. 45 - 61
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Copyright © The Author(s), 2021. Published by Cambridge University Press on behalf of the British Lichen Society

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