Figure 1.

Natural abundance of ¹³C (δ¹³C) of fungal fruit bodies and of the host trees of ectomycorrhizal fungi (as indicated by connecting lines) in mixed temperate forests at two sites, Åheden and Stadsskogen, in Sweden. Promiscuous fungi are non-host-specific ectomycorrhizal fungi. Pine (P. sylvestris) is the dominant tree at both sites, most closely followed by spruce (P. abies) and birch (B. pendula). Other trees are A. incana, P. tremula, and S. caprea. Ectomycorrhizal fungi are arranged in groups according to their host specificity (compare with Table 1). Bars show SD of single observations. Replicates are individuals in case of host trees; in case of fungi, replicates are species (Table 1).