A MONOGRAPH OF THE GENUS PARMELIA IN NORTH AMERICA, NORTH OF MEXICO1 EI)WARD CAIN BERRYFormerly Graduate Student in the Shaw School of Botany of Washington University INTRODUCTION This study has been conducted with the purpose of bringingabout an orderly arrangement of the species of Parmelia andto clarify the literature of the genus for North America, northof Mexico. During this investigation, all obtainable types werestudied. Where types have been lacking, original descriptionsand illustrations have been studied and compared with exsic-catae and collections from the type localities for the purposeof correlating the description of those species with the ma-terial at hand. To prevent confusion, in the literature of thegenus Zahlbruckner's arrangement of the species in Englerand Prantl (Nat. Pflanzenfam. ed. 2, 8: 233. 1926) las beenfollowed, except where the monographer believes that Zahl-bruckner is in error. HISTORY The genus Parmelia was established by Acharius in 1803,to supersede Imbricaria Acharius (1794). Imbricaria wasused by various workers to designate the genus until 1930,when Parmelia Acharius was placed provisionally in nominagenerica conservanda, and Imbricaria Acharius in nominarijicienda (International Rules of Botanical Nomenclature,suppl. nomina generica conservanda proposita. 127. 1930).In Acharius' treatments subsequent to 1803 (LichenographiaUniversalis. 1810; and Synopsis Methodica Lichenum. 1814),he removed considerable portions of the genus as first con-sidered. Of the species which he retained in this last treat-ment, most remain in the genus as it is understood to-day. 1An investigation carried out at the Missouri Botanical Garden in the GraduateLaboratory of the Henry Shaw School of Botany of Washington University andsubmitted as a thesis in partial fulfillment of the requirements for the degree ofDoctor of Philosophy.Issued February 26, 1941.(31)
BioStor
