A crustose lichen species new to science – previously characterized in the literature
but unnamed – is formally described. This new species, Chrysothrix bergeri sp. nov.,
ranges from the southeastern United States southwards to the Caribbean islands (Bahamas
and Cuba) and eastwards to Bermuda. It is most easily confused with C. xanthina, from
which it differs in both chemistry and ascospore shape. Bilimbia aurata and Bilimbia stevensoni
are both confirmed as synonyms of C. xanthina. A lectotype is selected for Bilimbia
aurata. Solvent E is recommended for the chromatographic separation of leprapinic and
pinastric acids – two lichen secondary products critical for diagnosing certain species of
Chrysothrix, including C. bergeri.
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Berger, F. & LaGreca, S. 2014. Contributions to the lichen flora of Bermuda – Part I. New records, new combinations, and interesting collections of lichenized ascomycetes. Evansia 31: 41–68.
Culberson, C. F. & Johnson, A. 1982. Substitution of methyl tert-butyl ether for diethyl ether in the standardized thin-layer chromatographic method for lichen products. Journal of Chromatography 128: 253–259.
Elix, J. A. & Crook, C. E. 1992. The joint occurrence of chloroxanthones in lichens, and a further thirteen new lichen xanthones. The Bryologist 95: 52–64.
Fletcher, A. & W. O. Purvis. Chrysothrix. In: Smith C. W., Aptroot, A., B. J. Coppins B. J., O. L. Gilbert, P. W. James & Wolseley, P. A. 2009 (eds). The Lichens of Great Britain and Ireland (2nd edition), pp. 208–309. British Lichen Society, London.
Harris, R. C. & Ladd, D. 2008. The lichen genus Chrysothrix in the Ozark ecoregion, including a preliminary treatment with for eastern and central North America. Opuscula Philolichenum 5: 29–42.
Kukwa M. & Knudsen, K. 2011. Notes on the identity of Chrysothrix populations (Arthoniales, Ascomycota) containing pinastric acid from southern and central California. Mycotaxon 116: 407–411.
Lendemer, J. C., Harris, R. C. & Ruiz, A. M. 2016. A review of the lichens of the Dare Regional Biodiversity Hotspot in the Mid-Atlantic Coastal Plain of North Carolina, eastern North America. Castanea 81: 1–77.
Olszewska, S., Zwolicki, A., & Kukwa, M. 2014. Chemistry and morphology of Chrysothrix candelaris in Poland, with notes on the taxonomy of C. xanthina. Mycotaxon 128: 165–172.
Lichen Diversity on an Arborescent Runner Oak (Quercus pumila) in South Florida, USA Scott LaGreca, Gary Perlmutter, Douglas Goldman, Frederick Seavey, Jean Seavey Evansia
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