Abstract
Of 728 herbarium specimens of Pseudevernia furfuracea (L.) Zopf from Norway 48.8% were found to contain olivetoric acid, 1.2% olivetoric and physodic acids, and 50.0% physodic and oxy–physodic acids as the main lichen products of the medulla. The proportion of specimens contaning olivetoric acid increased along a gradient from South East to North West Norway. The distribution of the chemotypes showed no correlation with altitude, effective temperature sum, annual mean precipitation, precipitation frequency or substrate ecology. The biological isolation of the chemotypes is questioned, and it is considered most appropriate to treat them as chemical strains within one species.
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