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On Rhizocarpon Obscuratum (ACH.) Massal., with notes on some Related Species in the British Isles

Published online by Cambridge University Press:  28 March 2007

Alan Fryday
Alan Fryday*
Affiliation:
Department of Landscape, University of Sheffield, Sheffield, S10 2TN, UK
*
Herbarium, Department of Botany & Plant Pathology, 166 Plant Biology, Wilson Road, Michigan State University, East Lansing, MI 48824, USA. E-mail: fryday@msu.edu
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Abstract

The specimens upon which Lecidea petraea var. obscurata Ach., the basionym of Rhizocarpon obscuratum (Ach.) Massal., is based are shown to be mostly referable to the species currently known as R. lavatum (Fr.) Hazslin. Rhizocarpon reductum Th. Fr. is resurrected to accommodate specimens with small ascospores previously referred there. The related species R. sublavatum is described from the Scottish Highlands and descriptions provided for R. anaperum (Vain.) Vain, and R. amphibium (Fr.) Th. Fr. These species are compared with R. reductum, R. lavatum and R. petraeum. Rhizocarpon rubescens Th. Fr. is shown to be a distinct species recorded from Europe and N. America.

Type
Research Article
Information
The Lichenologist , Volume 32 , Issue 3 , May 2000 , pp. 207 - 224
Copyright
Copyright © British Lichen Society 2000

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