Cetrelia cetrarioides and C. monachorum (Parmeliaceae) in the New World

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Abstract
In the New World C. cetrarioides and C. monachorum are well represented only in the southern Appalachian Mountains [USA] where the latter species is about 10-fold more common than the former. These species appear to be equally abundant in western Europe. Both species are reported from the highlands of Oaxaca, Mexico, extending the known southern range of the genus in the New World some 2500 km southwest of the southern Appalachians. The complex but remarkably stable chemosyndromes of each species from Mexico, North American and Europe are illustrated by reverse-phase high performance liquid chromatography.

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