Abstract
Lichen sensitivity to SO 2, NO 3 − and to the combination of both pollutants in three fruticose lichen species, Anaptychia ciliaris (L.) Körber, Evernia prunastri (L.) Ach. and Ramalina farinacea (L.) Ach., was studied by evaluating pigment status. A synergistic inhibitory effect of the combination SO 2 + NO 3 − was evident. The role of NO 3 − as a nutrient and as a phytotoxic agent, as well as the differential sensitivity of the species to SO 2 when applied alone, are discussed.
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