Ramaut, JL 1965: Une novelle mise en doute de la valeur chimiotaxonomique de l'acide usnique: le cas de Parmelia escaperata Mull. Arg. et de P. concrescens Wainio. - Bull. Jard. Bot. de l'Etat [Bruxelles]35: 67-72. [RLL List # 60 / Rec.# 15258] Keywords: CHEMOTAXONOMY/ USNIC/ PARMELIA/ EUROPE
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