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The response of corticolous lichens to artificially induced chemical damage was compared to symptoms found on damaged lichens in the field. Experimental thalli were damaged and observed (1)in situin a relatively pristine area, and (2) in a growth chamber either hydrated continuously or periodically. Lichenicolous fungi encountered includedCornutispora lichenicola,Lichenoconium erodens,Phoma cytospora,Vouauxiomyces...