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Culberson, CF/ Hale, ME", Jr 1973: Chemical and morphological evolution in Parmelia sect. Hypotrachyna: product of ancient hybridization?. - Brittonia 25: 162-173. [RLL List # 87 / Rec.# 3751]
Keywords: HYPOTRACHYNA / MORPHOLOGY / CHEMISTRY/ EVOLUTION/ HYBRIDIZATION
Abstract: [19 species; biogenetic considerations of secondary products. "The major chemistries show clear correlation with geography, but groups based upon morphological characters do not. The origin of the present day species can be explained by ancient hybridizations of chemically different types and subsequent parallel morphological evolution."]

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