Weber, WA 1977: Environmental modification and lichen taxonomy. - In: M. R. D. Seaward (ed.): Lichen Ecology. . Academic Press, London pp. 9-29. [RLL List # 100 / Rec.# 20038] Keywords: MODIFICATION/ TAXONOMY/ ENVIRONMENT/ REVIEW
Abstract: ["... can the lichenologist distinguish environmental modifications from genetic ecotypes in the absence of a body of experimental evidence? ... I believe that he can and must."]