Figure 5.

(a) Heat map showing relative abundance of 1–34 in UK and Danish F. excelsior (top row) and presence/absence of 1–34 in F. mandschurica. Green and purple shading indicate the difference between peak areas of each compound in UK and Danish samples that have p value < 0.05. *p value < 0.1. Cells that are split indicate that there was a different outcome of the t-test for [M+Na]⁺ and [M–H]⁻ adducts of these compounds. (b) Extracted ion chromatograms representing [M+Na]⁺ adducts of 1–33 observed in F. mandschurica.