Name requested: Umbilicaria arctica

	Lichenologist 3 (1): 150. 12 (1): 101.
	Lichens of North America null: 703.
	Mycotaxon 18 (1): 178. 35 (2): 385. 48: 259, 263, 264. 53: 106. 58: 223. 74 (2): 438, 443.