Terrestrial orchids require the presence of a compatible fungal partner for seed germination and continued growth (Rasmussen, 1995 and Peterson et al., 1998). In this study, fungal specificity is defined as the diversity of mycorrhizal fungi compatible with an orchid and the shape of compatibility links between orchids and fungi referred to as webs. The diversity of compatible fungi is expected to influence the competition, survival and distribution of orchids