Hodkinson, Brendan P. , Lendemer, James C. .
How do you solve a problem like Xanthoparmelia? Molecular analyses reveal semi-cryptic species in an Australasian-American 'disjunct' taxon.
Evolutionary relationships between populations of Xanthoparmelia tasmanica are investigated using parsimony, likelihood, and Bayesian analyses of ITS sequence data. The results indicate that this taxon is comprised of at least two geographically distinct lineages. Moreover, these lineages belong to two larger clades of Xanthoparmelia s. str. (each of which is also defined by geography) that have been recognized in previous phylogenetic studies of the genus. In light of these results, the geographically distinct, but morphologically and chemically identical populations of X. tasmanica should be treated as separate taxa with independent evolutionary histories. North American populations previously called "X. tasmanica" are referred to X. hypofusca. These results are discussed in light of recent work indicating that alpha-diversity in the genus has been over-estimated.
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1 - Duke University, Department of Biology, 139 Biological Sciences Building, PO Box 90338, Durham, North Carolina, 27708, USA
2 - The New York Botanical Garden, Institute of Systematic Botany, The New York Botanical Garden, Bronx, NY, 10458-5126, USA
Presentation Type: Poster:Posters for Sections
Location: Hall A/Convention Center
Date: Monday, August 2nd, 2010
Time: 5:30 PM