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Calicium sequoiae, a new lichen species from north-western California, USA

Published online by Cambridge University Press:  06 June 2008

Cameron B. WILLIAMS
Affiliation:
Department of Biological Sciences, Humboldt State University, Arcata, CA 95521, USA. Email: [email protected]
Leif TIBELL
Affiliation:
Department of Systematic Botany, Evolutionary Biology Centre, Uppsala University, Norbyvägen 18D, SE 75236 Uppsala, Sweden

Abstract:

We describe Calicium sequoiae as a new species of lichenized Ascomycota from north-western California, USA. The species is distinguished morphologically from other known members of Calicium by its stalks that react I+ blue, mature ascospores that are ornamented with spiral ridges, and apothecia that produce prominent white pruina. It is also the only Calicium known to produce thamnolic acid as a major secondary substance. Sequences from the ITS-region showed C. sequoiae to be unique among calicioid Physciaceae, and phylogenetic analysis positioned it close to C. adspersum, C. chlorosporum, C. lenticulare, Cyphelium notarisii, and C. tigillare. Thus far, Calicium sequoiae has been collected only from old-growth redwood (Sequoia sempervirens) forests, where it occurred on thick, fibrous bark of large redwood trees. A key to the 12 species of Calicium known from the Pacific Northwest is provided.

Type
Research Article
Copyright
Copyright British Lichen Society 2008

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