T. magnivelare has been found in ectomycorrhizal association with a variety of conifers, e.g., Pinus spp. (pines) and Abies spp. (firs) (Murata et al. 1999; Yun et al. 1997). Amaranthus et al. (2000) found T. magnivelare to be symbiotic with Abies magnifica var. shastensis (Shasta red fir) where the mushroom received carbohydrates from the tree and provided moisture and mineral nutrition to the tree (Hosford 1997; Kranabetter et al. 2002). Studies in British Columbia found T. magnivelare most commonly associated with Tsuga heterophylla (Raf.) Sarg. (western hemlock) and with Pinus contorta var. latifolia Engelm. (lodgepole pine) (Kranabetter et al. 2002). It has also been found to be ectomycorrhizal with Pinus banksiana Lamb. (jack pine) in northeastern North America, Pinus contorta var. latifolia in the Rocky Mountains, Pinus teocote in Mexico, Pinus ponderosa Lawson & C. Lawson (ponderosa pine) in California and the Pacific Northwest (Kuo 2006). Other North American associates include Lithocarpus densiflorus (tanoak) (Luoma et al. 2006; Yun et al. 1997) and Arbutus menziesii (Pacific madrone) (Luoma et al. 2006). Pinus douglasiana, Quercus scytophylla, Quercus crassifolia, Quercus conzattii, and Arbutus spp. are other known Mexican associates (Martinez-Carrera et al. 2002).
T. magnivelare is ecologically important for Allotropa virgata Torr. & A. Grey ex A. Gray (candystick), an achlorophyllous, obligate, myco-heterotrophic plant that uses the mushroom’s mycelia as its carbon source (Leake 2005). T. magnivelare mycelia can be found directly below individuals of A. virgata, but fruiting bodies of the mushroom will be found 5-15 ft away from the Allotropa (Viess 2012). There may be a complex relationship between Abies magnifica var. shastensis, T. magnivelare, and A. virgata. In southern Oregon, A. magnifica var. shastensis and A. virgata presence can be used as indicators for locating T. magnivelare (Amaranthus et al. 2000).
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