Journal
LICHENOLOGIST
Volume 36, Issue -, Pages 227-234Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S0024282904014306
Keywords
Antarctica; Bayesian statistics; combined analysis; lichens; species concept; Umbilicaria
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The Antarctic endemics Umbilicaria kappenii and U. antarctica are morphologically close, but mainly distinguished by their reproductive strategies. Umbilicaria antarctica propagates by means of thalloconidia. Umbilicaria kappenii lacks thalloconidia, but exhibits a variety of asexual propagules: soredia, adventive lobes and thallyles. We have now employed molecular data from three gene regions to examine the phylogenetic relationships of these two morphotypes. The phylogeny often samples and four outgroup taxa (Umbilicaria decussata, U. krascheninnikovii, U. nylanderiana, U. umbilicaiioides) was reconstructed using Bayesian and maximum parsimony analyses of a combined data set of nuclear ITS, nuclear LSU rDNA and mitochondrial LSU rDNA sequences. Forty two new partial sequences of 14 specimens were generated. Our results indicate that all samples morphologically referred to U. antarctica and U. kappenii form a monophyletic group. A topology separating the two morphotypes as phylogenetic species is significantly rejected with the data set. It is proposed to place U. kappenii into synonymy with U. antarctica.
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