Orchid mycorrhiza allowed for the identification of specific taxa forming symbiotic relationships which are of interest in the study, cultivation, and conservation of orchids. This is especially important in the trade and preservation endangered species or orchids of commercial value like the vanilla bean. There have been seen trends in the type of symbioses found in orchids, depending primarily on the life-style of the orchid, as the symbiosis is primarily of benefit to the plant. Terrestrial orchids have been found to commonly associate with Tulasnellaceae, however some autotrophic and non-autotrophic orchids do associate with several ectomycorrhizal fungi. Epiphytic fungi, however, may associate
Diuris longifolia It grows in sand, lateritic loam, clay and granite in moist situations. "Diuris longifolia" is not threatened at present. Diuris longifolia Diuris longifolia is a species of orchid which is endemic to the south-west of Western Australia. It has a variety of common names including purple pansy orchid, donkey orchid, common donkey orchid and wallflower orchid. It was one of the first three terrestrial orchids to be named from Western Australia, along with "Caladenia menziesii" (now "Leptoceras menziesii") and "Caladenia flava". "Diuris longifolia" is a tuberous, perennial herb with channelled, linear leaves 10–20 cm long. The flowers are 2.5–4.5 cm