Article (Périodiques scientifiques)
The fruticose genera in the Ramalinaceae (Ascomycota, Lecanoromycetes): their diversity and evolutionary history
Spjut, Richard; Simon, Antoine; Guissard, Martin et al.
2020In MycoKeys, 73, p. 1-68
Peer reviewed vérifié par ORBi
 

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Mots-clés :
Atacama; Baja California; Namib; Namibialina; Niebla; Ramalina; taxonomy; Vermilacinia; Vizcaíno deserts
Résumé :
[en] We present phylogenetic analyses of the fruticose Ramalinaceae based on extensive collections from many parts of the world, with a special focus on the Vizcaíno deserts in northwestern Mexico and the coastal desert in Namibia. We generate a four-locus DNA sequence dataset for accessions of Ramalina and two additional loci for Niebla and Vermilacinia. Four genera are strongly supported: the subcosmopolitan Ramalina, the new genus Namibialina endemic to SW Africa, and a duo formed by Niebla and Vermilacinia, endemic to the New World except the sorediate V. zebrina that disjunctly occurs in Namibia. The latter three genera are restricted to coastal desert and chaparral where vegetation depends on moisture from ocean fog. Ramalina is subcosmopolitan and much more diverse in its ecology. We show that Ramalina and its sister genus Namibialina diverged from each other at c. 48 Myrs, whereas Vermilacinia and Niebla split at c. 30 Myrs. The phylogeny of the fruticose genera remains unresolved to their ancestral crustose genera. Species delimitation within Namibialina and Ramalina is rather straightforward. The phylogeny and taxonomy of Vermilacinia are fully resolved, except for the two youngest clades of corticolous taxa, and support current taxonomy, including four new taxa described here. Secondary metabolite variation in Niebla generally coincides with major clades which are comprised of species complexes with still unresolved phylogenetic relationships. A micro-endemism pattern of allopatric species is strongly suspected for both genera, except for the corticolous taxa within Vermilacinia. Both Niebla and saxicolous Vermilacinia have chemotypes unique to species clades that are largely endemic to the Vizcaíno deserts. The following new taxa are described: Namibialina gen. nov. with N. melanothrix (comb. nov.) as type species, a single new species of Ramalina (R. krogiae) and four new species of Vermilacinia (V. breviloba, V. lacunosa, V. pustulata and V. reticulata). The new combination V. granulans is introduced. Two epithets are reintroduced for European Ramalina species: R. crispans (= R. peruviana auct. eur.) and R. rosacea (= R. bourgeana auct. p.p). A lectotype is designated for Vermilacinia procera. A key to saxicolous species of Vermilacinia is presented.
Centre/Unité de recherche :
Biological Sciences from Molecules to Systems - inBioS
Disciplines :
Microbiologie
Sciences de l’environnement & écologie
Auteur, co-auteur :
Spjut, Richard
Simon, Antoine  ;  Université de Liège - ULiège > InBioS
Guissard, Martin
Magain, Nicolas  ;  Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Département de Biologie, Ecologie et Evolution
Sérusiaux, Emmanuël ;  Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Département de Biologie, Ecologie et Evolution
Langue du document :
Anglais
Titre :
The fruticose genera in the Ramalinaceae (Ascomycota, Lecanoromycetes): their diversity and evolutionary history
Date de publication/diffusion :
11 septembre 2020
Titre du périodique :
MycoKeys
ISSN :
1314-4057
eISSN :
1314-4049
Maison d'édition :
Pensoft Publishers, Bulgarie
Volume/Tome :
73
Pagination :
1-68
Peer reviewed :
Peer reviewed vérifié par ORBi
Disponible sur ORBi :
depuis le 14 septembre 2020

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