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Type studies in the Rhizocarpon geographicum group (Rhizocarpaceae, lichenized Ascomycota)

Published online by Cambridge University Press:  19 February 2016

Beatriz ROCA-VALIENTE ,
David L. HAWKSWORTH ,
Sergio PÉREZ-ORTEGA ,
Leopoldo G. SANCHO  and
Ana CRESPO
Beatriz ROCA-VALIENTE
Affiliation:
Departamento de Biología Vegetal II, Facultad de Farmacia, Universidad Complutense de Madrid, Plaza de Ramón y Cajal S/N, Madrid E-28040, Spain. Email: brocaval@ucm.es
David L. HAWKSWORTH
Affiliation:
Departamento de Biología Vegetal II, Facultad de Farmacia, Universidad Complutense de Madrid, Plaza de Ramón y Cajal S/N, Madrid E-28040, Spain. Email: brocaval@ucm.es
Sergio PÉREZ-ORTEGA
Affiliation:
Real Jardín Botánico de Madrid, CSIC, Claudio Moyano 1, Madrid, E-28014, Spain
Leopoldo G. SANCHO
Affiliation:
Departamento de Biología Vegetal II, Facultad de Farmacia, Universidad Complutense de Madrid, Plaza de Ramón y Cajal S/N, Madrid E-28040, Spain. Email: brocaval@ucm.es
Ana CRESPO
Affiliation:
Departamento de Biología Vegetal II, Facultad de Farmacia, Universidad Complutense de Madrid, Plaza de Ramón y Cajal S/N, Madrid E-28040, Spain. Email: brocaval@ucm.es
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Abstract

As part of a comprehensive revision of the Rhizocarpon geographicum species group using molecular and morphological approaches, we examined the name-bearing types of 15 species. We report ambiguities and inconsistencies with the reported features of some type specimens, original descriptions, and circumscriptions employed in keys for the identification of taxa within the complex. The reporting of chemical reactions and some morphological characters was found to be inconsistent and likely to lead to errors of identification. This is unfortunate in view of the widespread use of the complex in glaciology for lichenometry. Issues surrounding the typification of the basionym Lichen geographicus are clarified, and the epitype is illustrated. The complex nomenclatural situation regarding the name Rhizocarpon lecanorinum and its typification is also made clear. The examination of the anatomical and morphological characters presented here needs to be considered together with molecular phylogenetic information to provide a more informed new taxonomy of the group.

Keywords

chemical spot testslichenometrylichensnomenclaturetypification

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Articles
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The Lichenologist , Volume 48 , Issue 2 , March 2016 , pp. 97 - 110
Copyright
© British Lichen Society, 2016 

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