Abstract
Summary In the epiphytic lichen Evernia mesomorpha NYL., metabolic proeesses such as photosynthetic CO 2 -fixation and protein and lipid biosyntheses were found to be very sensitive to SO 2 . Exposure of lichens to 0.1 ppm of gaseous SO 2 for increasing durations produced a progressive reduction in these processes. Protein biosynthesis appeared to be the process most sensitive to SO 2 . Fumigation of lichen tissues at 0.34 ppm of SO 2 for increasing durations caused an increased phytotoxic effect on all three metabolic processes. Such fumigations also inhibited acid phosphatase activity and caused an increase in the sulphur content of the tissues. During an SO 2 -free period after the fumigations, these metabolic processes recovered partially or completely in liehens exposed to 0.1 ppm SO 2 but showed little or no recovery in lichens exposed to 0.34 ppm SO 2 .
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