Name requested: Placynthium nigrum

	Annales Mycologici 36 (2-3): 134.
	Lichens of North America null: 48, 135, 573.
	Mycotaxon 13 (1): 97. 23: 247. 33: 32. 34 (1): 230. 40: 250. 58: 217. 61: 131. 94: 44.
	Sydowia 12 (1-6): 216.