M. Schultz 2007: Pterygiopsis. - In: T. H. Nash, III, C. Gries and F. Bungartz: Lichen Flora of the Greater Sonoran Desert Region. Volume 3. . Lichens Unlimited, Arizona State University, Tempe pp. 284-286. [RLL List # 210 / Rec.# 30328] Keywords: SONORAN DESERT/ UNITED STATES/ MEXICO/ PTERYGIOPSIS/ KEY
Abstract: [3 species; key.]