Esslinger, Theodore L. A new North American species in the lichen genus Physcia (Ascomycota) with a unique thallus morphology. Mycotaxon 90: 301-306. 2004.

ABSTRACT: A new species belonging to the lichen genus Physcia and with an unusual subcrustose growth form is described and illustrated. Physcia dakotensis, with a primary distribution in the northern Great Plains, has previously been mistaken for the eastern North American species P. subtilis.

KEYWORDS: Physciaceae, lichenized fungus, new species, taxonomy.