in Nash, Ryan, Gries & Bungartz, Lichen Flora of the Greater Sonoran Desert Region (Tempe) 1: 328 (2002). Type locality: Mexiko, Chihuahua, on acidic rock in woodland, Nash 31211 (ASU - holotype).
Type locality: Mexiko, Chihuahua, on acidic rock in woodland, Nash 31211 (ASU - holotype).