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Contributions toward a new taxonomy of Central European freshwater species of the lichen genus Thelidium (Verrucariales, Ascomycota)

Published online by Cambridge University Press:  18 November 2008

Holger THÜS  and
Juri NASCIMBENE
Juri NASCIMBENE
Affiliation:
Department of Biology, University of Trieste, via Giorgieri 10 – 34100 Trieste, Italy.
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Abstract

The morphological circumscription of selected Central European freshwater species in the lichen genus Thelidium was re-examined against the background of a molecular phylogeny based on ITS sequences. Molecular data reveal a close relationship between Thelidium methorium, T. pertusatii and Verrucaria latebrosa contradicting the traditional separation of Verrucaria and Thelidium by ascospore septation. Thelidium methorium and T. pertusatii are closely related species. The distinction of Thelidium methorium and T. submethorium was supported both by differences in ITS sequences and morphology. Thelidium minutulum, T. pluvium and T. zwackhii form a distinct clade with small perithecia and a thin or absent involucrellum. Thelidium rehmii and T. minutulum differ morphologically only in larger variability of ascospore length and the arrangement of photobiont cells, but are clearly separated by their ITS sequences as well their ecological requirements. An identification key for epilithic freshwater species of Thelidium in Central Europe is given, a lectotype for T. pertusatii is chosen, and detailed remarks for each species are provided.

Keywords

amphibious lichensidentification keyITSphylogenetic analysistypification
Type
Research Article
Information
The Lichenologist , Volume 40 , Issue 6 , November 2008 , pp. 499 - 521
Copyright
Copyright © British Lichen Society 2008

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Footnotes

Botany Department, Natural History Museum, Cromwell Road, London, SW7 5BD. Email: h.thues@nhm.ac.uk

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