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Seedlings of Abies grandis, Alnus rubra, Pinus ponderosa, Picea sitchensis, Pseudotsuga menziesii and Tsuga heterophylla were grown in monoculture and dual culture in the greenhouse and inoculated with spore slurries of 20 isolates representing 15 species of ectomycorrhizal hypogeous fungi (11 Rhizopogon species, Alpova diplophloeus, Truncocolumella citrina, Melanogaster euryspermus and Zelleromyces gilkeyae). The primary objectives were to assess and compare the pattern of host specificity between symbionts and to study the influence of neighbouring plants on ectomycorrhiza development. None of the fungal species had broad host range affinities. A variety of specificity responses were exhibited by the different fungal taxa, ranging from genus‐restricted to intermediate host range. In monoculture, nine species of Rhizopogon (R. arctostaphyli, R, ellenae, R, flavofibrillosus, R. occidentalism R …