Hale, Mason E., Jr. A monograph of the lichen genus Pseudoparmelia lynge (Parmeliaceae) - Washington : Smithsonian Institution, 1976 - 62 p. : ilus. - Smithsonian contributions to botany ; 31 . - Smithsonian contributions to botany ; 31 . LCCN: 24291 Subjects--Topical Terms: LĂquenes.Parmeliaceas.