Differences between the three mycoheterotrophic orchid fungal communities. Comparison of the fungal communities found on the three orchid species (AM, A. montana, AC, A. caudata and CE, C. exigua). (a) Rarefaction curves for ectomycorrhizal fungal species. (b) Detrended component analysis of orchid individuals plotted in two dimensions, based on ectomycorrhizal fungal communities (fungal taxa grouped by families; note that most points are superimposed). White circles: A. montana individuals; grey circles: A. caudata; black triangles: C. exigua. Large symbols represent means for each species, with standard deviations.