Meysurova, A. F., S. D. Khizhnyak & P. M. Pakhomov 2011: Toxic effect of nitrogen and sulfur dioxides on the chemical composition of Hypogymnia physodes (L.) Nyl.: IR spectroscopic analysis. - Contemporary Problems of Ecology 4(2): 186-194. [RLL List # 223 / Rec.# 32933] Abstract: Effect of some pollutants on the lichen Hypogymnia physodes is investigated. It is established experimentally that the greatest changes in the chemical composition of the lichen are caused by short-term exposure to 32 and 65% nitric acid and long-term exposure (14-21 days) to low concentrations (3 and 6%) of sulfuric acid.