Fig. 1. Evidence for ¹³C transfer in the Quercus – Pinus – Quercus combination (n = 2).

The orange arrow denotes ¹³C transfer as it passed across kingdoms, from tree to fungi and on to another tree, facilitated through the EMF specie Tomentella ellisii. White arrows denote ¹³C allocation within the tree tissues. Values are averages±SE of samples taken along time-points: stem (n = 3), leaves (n = 11) and roots (n = 10).