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Molecular phylogeny of parmotremoid lichens (Ascomycota, Parmeliaceae)

     Departamento de Biología Vegetal II, Facultad de Farmacia, Universidad Complutense de Madrid, Madrid 28040, España

John A. Elix

     Australian National University, Department of Chemistry, Faculty of Sciences, Canberra, ACT 0200, Australia

H. Thorsten Lumbsch

     Department of Botany, The Field Museum, 1400 South Lake Shore Drive, Chicago, Illinois 60605-2496

Parmotrema is one of the larger genera segregated from Parmelia s. lat. Additional genera recently have been segregated from this large genus based mainly on morphological and chemical features. We have employed molecular data from three genes to continue a revision of the generic concept within the parmelioid lichens. A Bayesian analysis of nuclear ITS, LSU rDNA and mitochondrial SSU rDNA sequences was performed. The genera Canomaculina, Concamerella, Parmelaria and Rimelia appear nested within Parmotrema. Alternative hypotheses to maintain the independence of Canomaculina, Concamerella and Rimelia are shown to be highly unlikely and are rejected. As a consequence these three genera are reduced to synonymy with Parmotrema. An alternative topology segregating Parmelaria from Parmotrema s. lat. cannot be rejected with the dataset at hand. However we have established that this genus is closely related to Parmotrema rather than to cetrarioid species as was considered previously. The revised genus Parmotrema includes species that have an upper cortex consisting of a palisade plectenchyma or rarely paraplectenchyma with vaults, have a pored or fenestrated epicortex, lack pseudocyphellae, have or lack cilia, have laminal, perforate or eperforate apothecia, usually have simple rhizines and filiform, cylindrical, bacilliform or sublageniform conidia. It is closely related to Flavoparmelia but the status of these genera requires further investigation. Nineteen new combinations are made.

Key words: Bayesian statistics, Canomaculina, combined analysis, Concamerella, Parmelaria, Parmotrema, Rimelia

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