Abstract
Hypogymnia physodes (L.) W. Wats., Peltigera canina (L.) Willd., and Evernia prunastri (L.) Ach. were grown in the laboratory in flasks to which had been added varying amounts of sulfur dioxide or hydrogen fluoride. After 65 days, the E. prunastri that had been exposed to 0.30 ppm or more SO0, the H. physodes that had been exposed to 100 ppm or more SO0, and the P. canina that had been exposed to 300 ppm or more S02 leaked large amounts of electrolytes, compared to controls, when immersed for two minutes in deionized distilled water. Peltigera canina exposed to 10 ppm or more HF for 18 days also showed increased leakage of electrolytes.
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