Tuber regimontanum is an ectomycorrhizae truffle associated with Quercus polymorpha that can be recognized by its blackish color peridium. Microscopically, T. regimontanum can be recognized by having ascospores of 33-55 (-62) x 23-31 µ and by DNA (ITS) variation.
Tuber regimotanum is a rare hypogeous ectomycorrhizal fungus only known from the type locality from northeastern Mexico. This truffle is associated with Quercus polymorpha (and other species) forests, This vegetation is threatened by wild fires, illegal deforestation and changes in land use. This species should be protected because of its limited distribution to northeastern Mexico.
Tuber regimontanum is only known from Nuevo León, locality of Sierra of Picachos, Municipality of Higueras. The collecting site is part of the Sierra Madre Oriental This species grows in ectomycorrizal associated with Quercus polymorpha forest.
GBIF (2019) do mention one occurrence from the same type locality. This truffle is known from one single sampling locality: one single collections from one single site from northeastern Mexico. The Quercus polymorpha hills hosts this species. In addition, efforts to find this hypogeous species have been unsuccessful in the last 10 years. Tuber regimontanum was described by Guevara et al 2008. The few existing specimens and records do not seem to be a result of an undersampling.
Ascomata are hypogeous, gregarious, associated with Quercus polymorpha trees producing few sporocarps. Its fruiting season is in Fall (August) at 306 m elevation.
The only known population of Tuber regimontanum grows associated with Quercus spp. forest. The Quercus polymorpha forests are subjeted to land cover-change, illegal timber extraction and wild fires. Urban expansion is severely threatening the surrounding forests and therefore T. regimontanum as well.
Tuber regimontanum is presented in the Ecological Reserve Sierra of Picachos, Municipality of Higueras, Nuevo Leon, Mexico. An action priority to protect this truffle would be to protect its habitat and other endangered species of fungi. Tuber regimontanum is not enlisted in either Red nor National lists up to date.
Increase sampling to other sites where Quercus polymorpha is present. In addition, analysis of the ITS and other genes are required for phylogenetic and evolutionary studies from fresh and dried specimens to know more about the relationship between T. regimontanum and quercus spp. in northeaster Mexico.
There are not reports about edibility or use of this species, however, it is suspected to be edible.
GBIF Secretariat. (2019). Tuber regimontanum. Retrieved May 25, 2019, from https://www.gbif.org/species/5451995
Guevara, G., G. Bonito, E. Cázares, J. A. Rodriguez y R. Vilgalys. 2008. Tuber regimontanum, new species of truffle from Mexico. Revista Mexicana de Micología. 26: 17-20.