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Two New Sorediate Taxa of Peltigera

Published online by Cambridge University Press:  28 March 2007

B. Goffinet
Affiliation:
Botany Department, The University of Alberta, Edmonton, Alberta, CanadaT6G 2E9.
R. I. Hastings
Affiliation:
Botany Department, The University of Alberta, Edmonton, Alberta, CanadaT6G 2E9. Provincial Museum of Alberta, Natural History Section, 12845 102 Avenue, Edmonton, Alberta, CanadaT5N 0M6.

Abstract

Examination of specimens of Peltigera didactyla, from Africa, Asia, Europe and North America revealed that this sorediate species includes three entities that can be separated on morphological characters. A new species, P. lambinonii, is described from East Africa, and a new combination P. didactyla var. extenuata, is proposed to accommodate morphs from mesic forest habitats in Asia, Europe and North America. Despite this taxonomic reduction, P. didactyla var. didactyla remains a ubiquitous taxon. The former two taxa often produce methyl gyrophorate, which can co-occur with traces of gyrophoric acid. These tridepsides were only rarely detected in var. didactyla; their occasional presence seems to be best explained by hybridization. The taxonomic and ecological significance of these substances is discussed.

Type
Research Article
Copyright
Copyright © British Lichen Society 1995

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