1. Bartak M, Hajek J, Vrablíkova H, Dubova J (2004) High-light stress and photoprotection in Umbilicaria antarctica monitored by chlorophyll fluorescence imaging and changes in zeaxanthin and glutathione. Plant Biol 3:331–341
2. Behera BC, Verma N, Sonone A, Makhija U (2005) Antioxidant and antibacterial activities of lichen Usnea ghattensis in vitro. Biotechnol Lett 27:991–995
3. Brodo LM, Sharnoff D, Sharnoff S (2001) Lichens of North America. Yale University Press, New Haven
4. Culberson CF (1969) Chemical and botanical guide to lichen products. University of North Carolina Press, Chapel Hill
5. Dorman HJ, Bachmayer O, Kosar M, Hiltunen R (2004) Antioxidant properties of aqueous extracts from selected Lamiaceae species grown in Turkey. J Agric Food Chem 52:762–770