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Willkomm, H/ Bölter, M/ Kappen, L 1992: Age estimation of Antarctic macrolichens by radiocarbon measurements. - Polarforschung 61(2/3): 103-112. [RLL List # 153 / Rec.# 20307]
Abstract: 4 fig. 3 tab. ["...the age of mature thalli of Caloplaca regalis, Ramalina terebrata and Usnea antarctica was determined to 32 years, while U. aurantiaco-atra and Himantormia lugubris gave an age of ca. 38 years and ca. 60 years, respectively."]

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