C. Printzen and K. Knudsen 2007: Placynthiella. - 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. 391. [RLL List # 210 / Rec.# 30278] Keywords: SONORAN DESERT/ UNITED STATES/ MEXICO/ PLACYNTHIELLA
Abstract: [1 additional species; key.]