title: Supraordinal phylogenetic relationships of Lecanoromycetes based on a Bayesian analysis of combined nuclear and mitochondrial sequences.
abstract: Phylogenetic relationships of lichen-forming discomycetes and their relatives in the class Lecanoromycetes were examined by using nuclear large subunit and mitochondrial small subunit ribosomal DNA sequences. Ninety-eight partial sequences of 53 ascomycetes were generated and aligned with the corresponding sequences retrieved from GenBank resulting in an alignment of 100 taxa that was analyzed using a Bayesian approach with Markov chain Monte Carlo (B/MCMC) methods. The analysis revealed the monophyly of the Lecanoromycetes with two major clades: one clade including the monophyletic orders Graphidales and Ostropales and the paraphyletic Gyalectales, the other clade including the monophyletic Lecanorales (incl. Caliciales, Peltigerales, and Teloschistales) and a clade containing the polyphyletic Agyriales, a yet undescribed order Umbilicariales (including Elixiaceae and Umbilicariaceae), and Pertusariales. The monophyly of the Pertusariales was not resolved. Testing of alternative hypotheses revealed that a placement of Chaetothyriomycetes and Eurotiomycetes within Lecanoromycetes and the monophyly of Agyriales s. lat. (incl. Elixiaceae and Schaereriaceae) and Ostropales s. lat. (incl. Graphidales) can be rejected, while monophyly of Gyalectales and the Pertusariales and placement of Umbilicariales on the Lecanorales branch cannot be rejected with the current data set.
authors.affiliation: Botanisches Institut, Universität Essen, Essen 45117, Germany. tlumbsch@fieldmuseum.org
authors.forename: H Thorsten
authors.initials: HT
authors.lastname: Lumbsch
authors.forename: Imke
authors.initials: I
authors.lastname: Schmitt
authors.forename: Zdenek
authors.initials: Z
authors.lastname: Palice
authors.forename: Elisabeth
authors.initials: E
authors.lastname: Wiklund
authors.forename: Stefan
authors.initials: S
authors.lastname: Ekman
authors.forename: Mats
authors.initials: M
authors.lastname: Wedin
mesh_terms: D001203:Ascomycota / Q000235:genetics / Q000378:metabolism*; D001499:Bayes Theorem; D002467:Cell Nucleus / Q000378:metabolism*; D004247:DNA / Q000737:chemistry; D004275:DNA, Ribosomal / Q000737:chemistry; D019992:Databases as Topic; D008928:Mitochondria / Q000378:metabolism*; D009010:Monte Carlo Method; D010802:Phylogeny; D013045:Species Specificity
chemical_list: D004275:DNA, Ribosomal; D004247:DNA