Abstract
The efficacy of three biocides (Benzalkonium chloride, Koretrel, and Rocima 110) on two endolithic lichens ( Acrocordia conoidea and Bagliettoa marmorea) was monitored in the laboratory and in the field with portable pulse-amplitude-modulated (PAM) equipment. For comparison, epifluorescence microscope observations were carried out in the laboratory on cross-sections of treated and untreated thalli. The PAM equipment revealed excellent sensitivity for quantifying variations that could not be appreciated in epifluorescence. The two lichens showed a differential resistance to the biocides, probably related to the different photobionts and absorption of the active principle. The contribution of Chl a F techniques to the field of stone conservation is discussed.
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