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Eleven collections of Cladonia furcata and fourteen of Cladonia rangiformis, mainly from Saxony Anhalt (Germany) have been analyzed for their lichen substances by HPLC and HPLC-MS. The main compounds of C. furcata are fumarprotocetraric acid, atranorin, protocetraric acid, rangiformic acid, bourgeanic acid, norrangiformic acid and the new lichen metabolite 1-methyl 3,4-dicarboxydecanoate. C. rangiformis is characterized by atranorin, rangiformic acid, norrangiformic acid and 1-methyl 3,4-dicarboxyhexadecanoate, while bourgeanic acid is absent.