• Proposed
  • Under Assessment
  • Preliminary Assessed
  • VUAssessed
  • 5Published

Tuber regimontanum Guevara, Bonito & J. Rodr.

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Scientific name
Tuber regimontanum
Author
Guevara, Bonito & J. Rodr.
Common names
 
IUCN Specialist Group
Cup-fungi, Truffles and Allies
Kingdom
Fungi
Phylum
Ascomycota
Class
Pezizomycetes
Order
Pezizales
Family
Tuberaceae
Assessment status
Assessed
Preliminary Category
VU B2ab(ii,iii); D2
Proposed by
Gonzalo Guevara-Guerrero
Assessors
Roberto Garibay Orijel, Gonzalo Guevara-Guerrero
Editors
Ricardo Garcia-Sandoval, Roberto Garibay Orijel
Contributors
Gonzalo Guevara-Guerrero
Comments etc.
Anders Dahlberg

Assessment Notes

This is a valuable black truffle intensively searched for 10 years since its description. It Is microendemic and has only one subpopulation in a threatened small area of 1000 km2.

Justification

The only known subpopulation of T. regimontanum occupies a potential AOO of 1000 km2. In this region the forests of its only known host Quercus polymorpha are fragmented and subject to continuous ilegal logging and fires. So its population is small with no more than 1000 individuals in only one known threatened locality with a high probability of increasing the extinction risk in the near future. Because of this the species should be listed as VU B2ab(ii,iii), D2.


Taxonomic notes

Tuber regimontanum is an hypogeous fungus associated with Quercus polymorpha that can be recognized by its blackish peridium. The species resembles T. melanosporum and T. indicum, however these species have smaller spores.
Microscopically, T. regimontanum can be recognized by the size if its ascospores 33-55 (-62) x 23-31 µ and by DNA (ITS) variation (Guevara et al 2008).


Why suggested for a Global Red List Assessment?

Tuber regimotanum is a rare hypogeous ectomycorrhizal fungus only known from the type locality from northeastern Mexico. It has been extensively looked for during the last 10 years. DNA sequences of this species have not been found elsewhere in the world or in other mexican oak forests. In consequence, its rarity is not due to under-sampling. The only known subpopulation of T. regimontanum occupies a potential AOO of 1000 km2. In this region the forests of its only known host Quercus polymorpha are fragmented and subject to continuous ilegal logging and fires. So its population is small with no more than 1000 individuals in only one known threatened locality with a high probability of increasing the extinction risk in the near future. Because of this the species should be listed as VU B2ab(ii,iii), D2.


Geographic range

Tuber regimontanum is endemic from Sierra of Picachos, Municipality of Higueras, Nuevo León state in Northeastern Mexico. Even while Tuber is extensively studied, there are no matches of DNA sequences to other vouchers or environmental sequences. So its microendemicity seems not a result of undersampling. Additionally, looking for similar DNA sequences in the Mexican Soil fungi database there are not matches even while the data base contain several oak forests.


Population and Trends

The species in only known from the type locality. Ten years continuous efforts to find additional locallities since its description in 2008 have have been unsuccessful. The few existing specimens and only one known population do reflect is local endemism and rarity and not seem to be a result of undersampling. The single population inhabits Quercus polymorpha forests that are continuosly affected by fires. Global warming and deforestation in the region will force a decline in its populations.

Population Trend: Decreasing


Habitat and Ecology

Ascomata are hypogeous, gregarious, and rare. The species is an ectomycorrhizal symbiont of Quercus polymorpha. Its fruiting season is in Fall (August) at 306 m elevation.

Subtropical/Tropical Moist Lowland Forest

Threats

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 only known population as well.

Housing & urban areasIntentional use: subsistence/small scale (species being assessed is the target) [harvest]Increase in fire frequency/intensity

Conservation Actions

The only know subpopulation of Tuber regimontanum inhabits the Ecological Reserve Sierra of Picachos, Municipality of Higueras, Nuevo Leon, Mexico. An priority action would be to protect this habitat diminishing wild fires and avoiding illegal timber extraction in the area. Tuber regimontanum is not enlisted in either global or National Red lists up to date.

Site/area protection

Research needed

Increase sampling to other sites where Quercus polymorpha is present.

Other

Use and Trade

There are not reports about edibility or use of this species, however, it is suspected to be edible.

Food - human

Bibliography

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.


Known distribution - countries

Regional Population and Trends

Country Trend Redlisted