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Ducatina umbilicata gen. et sp. nov., a remarkable Trapeliaceae from the subantarctic islands in the Indian Ocean

Published online by Cambridge University Press:  10 March 2017

Damien ERTZ ,
Ulrik SØCHTING ,
Alice GADEA ,
Maryvonne CHARRIER  and
Roar S. POULSEN
Damien ERTZ
Affiliation:
Department Bryophytes-Thallophytes (BT), Botanic Garden Meise, Nieuwelaan 38, B-1860 Meise, Belgium; and Fédération Wallonie-Bruxelles, Direction Générale de l’Enseignement non obligatoire et de la Recherche Scientifique, Rue A. Lavallée 1, B-1080 Bruxelles, Belgium. Email: damien.ertz@jardinbotaniquemeise.be
Ulrik SØCHTING
Affiliation:
Department of Biology, University of Copenhagen, Universitetsparken 15, DK-2100 Copenhagen Ø, Denmark
Alice GADEA
Affiliation:
Université de Rennes 1, UMR CNRS 6553, 263 Avenue du Général Leclerc, 35042 Rennes, France; and UMR CNRS 6226, 2 Avenue du Professeur Léon Bernard, 35043 Rennes, France
Maryvonne CHARRIER
Affiliation:
Université de Rennes 1, UMR CNRS 6553, 263 Avenue du Général Leclerc, 35042 Rennes, France
Roar S. POULSEN
Affiliation:
Smallegade 2, 9520 Skørping, Denmark
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Abstract

The new genus and species Ducatina umbilicata is described from Îles Crozet and Îles Kerguelen. This lichen is characterized by an umbilicate thallus with a black verrucose lower surface and a greyish to dark olivaceous smooth upper surface having large verrucae, large semi-immersed cephalodia, semi-immersed apothecia with a prominent thalline margin, simple, mainly ellipsoid ascospores of 23–42×12–25 µm and the presence of unknown chemical compounds. Phylogenetic analyses using nuLSU and mtSSU sequences place Ducatina in the Trapeliaceae (Baeomycetales). The new taxon is closely related to Orceolina antarctica and O. kerguelensis, two other lichens endemic to these subantarctic islands, differing by its morphology and the lack of chemical compounds. Ducatina is the only genus in the Trapeliaceae to develop a large umbilicate thallus.

Keywords

AspiciliopsisBaeomycetalesbiodiversitylichensOrceolinaphylogenyPlacopsistaxonomy
Type
Articles
Information
The Lichenologist , Volume 49 , Issue 2 , March 2017 , pp. 127 - 140
Copyright
© British Lichen Society, 2017 

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