3 , 4 and Supplementary Figure S1 ). Results The concentrations of usnic acid and fumarprotocetraric acid Difference between the lowland and mountain thalli During the whole investigation period, there was a highly significant difference in fumarprotocetraric acid and usnic acid concentrations between the lowland and mountain thalli, both in the control and treated samples (Supplementary Table S1 ).
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The long-term effect of removing the UV-protectant usnic acid from the thalli of the lichen <i>Cladonia foliacea</i>.
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