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Generic concepts in parmelioid lichens, and the phylogenetic value of characters used in their circumscription

Published online by Cambridge University Press:  05 October 2011

Ana CRESPO ,
Pradeep K. DIVAKAR  and
David L. HAWKSWORTH
Ana CRESPO
Affiliation:
Departamento de Biología Vegetal II, Facultad de Farmacia, Universidad Complutense de Madrid, Plaza Ramón y Cajal, Madrid 28040, Spain. Email: pdivakar@farm.ucm.es
Pradeep K. DIVAKAR
Affiliation:
Departamento de Biología Vegetal II, Facultad de Farmacia, Universidad Complutense de Madrid, Plaza Ramón y Cajal, Madrid 28040, Spain. Email: pdivakar@farm.ucm.es
David L. HAWKSWORTH
Affiliation:
Departamento de Biología Vegetal II, Facultad de Farmacia, Universidad Complutense de Madrid, Plaza Ramón y Cajal, Madrid 28040, Spain. Email: pdivakar@farm.ucm.es
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Abstract

This article traces the changing systems in the classification of the parmelioid lichens from the early 19th century to the present day. Molecular phylogenetic approaches have enabled the relative importance of traditionally used characters to be objectively re-assessed, and led to the realization of the significance of others that had previously been passed over or dismissed; for example, differences in ascospore and conidium types or the cell-wall constituents. Information on the different characters employed is presented and assessed. It is concluded that characters related to thallus form or chemical products prove to be less informative at the generic level than has sometimes been assumed. Features requiring further study are identified, and in the light of experience in this group, lichenologists should be cautious in translating their results into formal taxonomies.

Keywords

chemotaxonomyLecanoromycetesmolecular systematicsParmeliaceaetaxonomy
Type
Research Article
Information
The Lichenologist , Volume 43 , Issue 6 , November 2011 , pp. 511 - 535
Copyright
Copyright © British Lichen Society 2011

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