Key-Words: Lichens, lichen substances, Acarospora epithallina, A. hilaris, A. oxytona, Bryoria fuscescens, Buellia zahlbruckneri, Roccella fucoides, Usnea articulata. The following lichens from Turkey have been analysed for their metabolites: Acarospora epithallina: ( +)-rhizocarpic acid, gyrophoric acid, lecanoric acid; Acarospora hilaris: 3 samples with ( + )-rhizocarpic acid, 1 sample with ( +)-epanorin; Acarospora oxytona: rhizocarpic acid, acaranoic acid and acarenoic acid; Bryoria fuscescens: fumarprotocetraric acid, protocetraric acid, atranorin, ergosterol, glyceride, 3,4,4'-trihydroxy-ß-carotene; Buellia zahlbruckneri: 6-O- methylarthothelin; Roccella fucoides: erythrin, lecanoric acid, roccellic acid; Usnea articulata ssp. articulata: ( + )-usnic acid, fumarprotocetraric acid, D-arabitol, ergosterol, glyceride, n-alkanes.