Hale, Mason E. A monograph of the lichen genus Parmelia Acharius sensu stricto (Ascomycotina: Parmeliaceae) / Mason E. Hale, Jr. - Washington, DC : Smithsonian Institution Press, 1987. - Smithsonian contributions to botany ; no. 66 . Includes index. Bibliography: p. 52-54. LCCN: 86607945 Subjects--Topical Terms: Parmelia -- Classification.--Parmelia -- Classification.Lichens -- Classification.--Lichens -- Classification. LC Class. No.: QK585.P2 Dewey Class. No.: 581 s 589.1 National Agricultural Library Call No.: QK1.S6 / no. 66