Seven species of lichens such us Umbilicaria aff. calvescens, Hypotrachyna enderythraea, Punctelia graminicola, Cladonia chlorophaea, Xanthoparmelia farinose, Psiloparmelia distincta (rock and tree substrates; rs and ts), and Usnea durietzii were collected from the province of Arequipa - Peru. Their usnic acid (UA) and fatty acid (FA) amounts in methanol-acetone were determined by High-performance liquid chromatography with diode-array detection (HPLC-DAD) and Gas chromatography-flame ionization detector (GC-FID). The antimicrobial activities of these extracts were evaluated against Staphylococcus aureus ATCC strains (43300, 29213, 25923 and 700699), Escherichia coli strains (O157:H7 and ATCC 10536), Salmonella enterica sv typhimurium ATCC 14028, Candida albicans ATCC 90028 and Candida. tropicalis ATCC 750T. In addition, antioxidant capacity was also studied by Total phenolic content (TP...