Fig. S1 Results of the weathering experiment: the mean number of wells (of a total of 4, in each of 4 replicate microcosms) colonized by Paxillus involutus over 20 weeks.

Fig. S2 Results of the C-allocation experiment: shoot, root and EcM root tip fraction of total biomass, 14C, and P.

Fig. S3 Published apatite dissolution rates in relation to pH, (Welch et al., 2002;Guidry and MacKenzie, 2003; Chaïrat et al., 2007), compared to the rates reported in the present study.

Table S1. Nutrient solutions.

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