Name requested: Verrucaria nigrescens

	Lichenologist 3 (1): 153. 12 (1): 104.
	Lichens of North America null: 727, 728.
	Mycologia 1 (3): 88. 9 (3): 147, 148, 152. 11 (6): 307. 25 (4): 304, 305.
	Mycotaxon 33: 32. 34 (1): 231. 53: 153. 61: 116. 100: 342. 102: 391.
	Sydowia 16 (1-6): 85.