@article {12914,
	title = {A new circumscription for the common and widespread North American species Physcia subtilis, and description of a new species, P. thomsoniana},
	journal = {Opuscula Philolichenum},
	volume = {16},
	year = {2017},
	pages = {139-152},
	keywords = {Biology, Biology -- Classification and description},
	author = {THEODORE L. ESSLINGER}
}
