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Mycologia, 95(5), 2003, pp. 827-835.
© 2003 by The Mycological Society of America

Phylogeny of the lichen genus Placopsis and its allies based on Bayesian analyses of nuclear and mitochondrial sequences


Imke Schmitt 2
H. Thorsten Lumbsch 2

     Botanisches Institut, Universität Essen, 45117 Essen, Germany

Ulrik Søchting

     Department of Mycology, Botanical Institute, University of Copenhagen, Ø. Farimagsgade 2D, DK-1353 Copenhagen K, Denmark

The phylogenetic relationships of the lichen genus Placopsis and related genera in the Agyriales were analyzed using molecular data. We obtained a total of 66 new sequences from the nuclear ITS, LSU and the mitochondrial SSU rDNA. Phylogenetic analyses were conducted in a Bayesian and a maximum-parsimony framework. Our analyses show that Placopsis is paraphyletic with members of Orceolina nesting within the genus. A morphological character supporting the Placopsis-Orceolina clade is the non-amyloid ascus. The section Aspiciliopsis as defined by sunken fruiting bodies is not supported, but the type species of Aspiciliopsis is more closely related to Orceolina. This clade shares apothecia with reduced amphithecia as apomorphic character. We suggest resurrecting the generic name Aspiciliopsis. Trapelia is the sister genus to Placopsis and Aspiciliopsis/Orceolina.

Key words: Agyriaceae, Agyriales, ITS rDNA, molecular phylogeny, mt SSU rDNA, nu LSU rDNA, Orceolina, Trapelia




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Copyright © 2003 by The Mycological Society of America.