J Ethnopharmacol. 1999 Sep; 66(3): 343-6.

Occurrence of usnic acid in Usnea laevis Nylander (lichenized ascomycetes) from the Venezuelan Andes.

Marcano V, Rodriguez-Alcocer V, Morales Méndez A.

Centro de Microscopía Electrónica, Universidad de Los Andes, Mérida, Venezuela.

The presence of usnic acid in the lichen Usnea laevis Nyl. from the Venezuelan Andes was detected through chromotographic (TLC) and spectroscopic (IR, MS, 1H-NMR) methods. This compound was present in a concentration of 2.7% in the thallus. Usnic acid has a reported antibiotic activity and the lichen is utilized for medicinal purposes by Andean farmers.

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