Boletellus singeri is known to develop in subtropical Quercus and Quercus-Pinus forests located in Estado de Mexico, Guerrero, and Mexico City in Mexico, and western Belize. In Mexico the area of distribution of the species has been changed to urban territories but also to cropping and cattle lands. Is already known that one subpopulation of the species has been destroyed due to urban growth in areas proximate to Mexico City.
Boletellus singeri should be listed as Vulnerable under the criterion C1 as the number of known localities is only two with less than 100 mature individuals in each subpopulation. Even if 1,000 subpopulations would exist in other Quercus forest from Mexico and the rest of under sampled Central America, the entire population would be less than 10,000. The forests where B. singeri grows in Mexico are under huge pressure, associated with changes in land use including cropping, cattle and urban developments that will affect the forest quality where this species develops.
Boletellus singeri is clearly delimited by its special pale to light yellow color pileus and stipe, the glutinous cap and the white and glutinous veil in the stipe. Also, the yellow-color pileus changes to pink with KOH on its surface. It is distinguished from B. ellatus and B. jalapensis by the presence of a white glutinous-veil and spores with continuous fissures, and it is distinguished from B. longicollis by possessing larger spores (Gonzales-Velazquez & Valenzuela, 1995; Halling & Ortiz-Santana, 2009).
NOTE The documentation of this assessment is being revised and edited when finalized when entered to IUCNs Red-List database. Boletellus singeri is an ectomycorrhizal fungus whose distribution in Mexico is associated with subtropical oak and pine-oak forests in the Terrestrial priority region “Sierra de Taxco-Huautla”. Mexico is the country with the highest species richness of pines and oaks, which are endangered due to climate change, deforestation and changes in land use (Miranda-Aragón et al., 2012; Sáenz-Romero et al., 2016). This species should be protected because of its limited distribution to western Mexico, especially associated with endangered forests types.
Central and southwestern Mexico and Belize. Boletellus singeri was described from a pine-oak forest in Estado de Mexico, and collected another time outside the type locality, in Guerrero Mexico. Also, it was collected in 1988 10 Km near Ajusco Mountain, Mexico City; however the sampling locality was destroyed with the city expansion (GBIF, 2017). Additionally, Halling & Ortiz-Santana (2009) suggest that B. singeri also grows in two sites near Xalapa, Veracruz based on Singer´s dried collections (but reported as B. jalapensis) according to its macromorphological description. So in Mexico, the region where B. singerii distributes for sure is the Sierra Madre del Sur, at southwestern Estado de Mexico and northern Guerrero (GBIF, 2017; Halling & Ortiz-Santana, 2009). The only collection outside Mexican territory comes from Mountain Pine Ridge Forest Reserve in Belize.
According to GBIF (2017) there are seven un-doubtful records from three subpopulations in Mexico: the type locality in Tejupilco, Estado de Mexico, one subpopulation from Taxco, Guerrero, and one destroyed subpopulation close to Ajusco Mountain, Mexico City. Also, Halling & Ortiz-Santana (2009) reported other subpopulation from western Belize. GBIF, (2017) and Halling & Ortiz-Santana (2009) reported a subpopulation from three localities near Xalapa, Veracruz but this record is questionable until the synonymy between B. singeri and B. xalapensis is solved.
Population Trend: Stable
Boletellus singeri grows solitary to subgregarious in Quercus and Quercus-Pinus forests from Mexico, producing few sporocarps. In Belize it is reported from Quercus forest. This species is associated with subtropical oak dominated forest. Fruiting season is from July to November, but peaking in August in Mexico.
Boletellus singeri is an ectomycorrhizal fungus that grows in Quercus and Quercus-Pinus forest in Mexico. These forests are threatened due to different types of disturbances including climatic change, illegal timber extraction, and land use changes. Across Mexico, these kinds of forest have been dramatically changed to cropping and cattle. Particularly some areas near Mexico City are highly threatened due to changes in land uses to convert forests areas into urban territories, where threats like edge effects and pollution via atmospheric deposits, could affect the forests where B. singeri develops.
By now, none of the known sites where B. singeri develops is a protected area; so it would be necessary to establish a biological corridor between the two subpopulations of B. singerii in “Sierra de Taxco-Nevado de Toluca” and “Sierra Taxco-Huatla”, between Estado de Mexico and Guerrero, and expand the current area of “Cerro Huixteco” National Park or change to a higher protection status.
It is priority to sequence and conduct phylogenetic analysis to the Veracruz specimens in the Field Museum (F-1097236; F-1097229; F-1097237) to determine if the dried specimens belong to B. singeri as suggested by Halling & Ortiz-Santana (2009); if so, these subpopulation has to be included in the species geographical distribution. Also, to conduct more field collections in oaks and oak-pine forests from “Sierra Madre del Sur” to elucidate if B. singeri known distribution is constrained by the absence of records, or if it represents the natural species distribution range. At the same time, this would allow establishing biological corridors between adjacent areas where B. singeri develops and ensure genetic exchange.
There are not reports about edibility or use of these species.
GBIF (2017). Boletellus singeri Gonz.-Velázq. Retrieved February 14, 2018, from https://www.gbif.org/occurrence/search?taxon_key=3354130
Gonzales-Velazquez, A., & Valenzuela, R. (1995). A new species of Boletellus (Basidiomycotina, Agaricales: Boletaceae) from Mexico. Mycotaxon, 55, 399–404.
Halling, R. E., & Ortiz-Santana, B. (2009). A revision of Boletellus sect. Ixocephali. Mycological Progress, 8(3), 237–244. http://doi.org/10.1007/s11557-009-0595-3
Miranda-Aragón, L., Treviño-Garza, E. J., Jiménez-Pérez, J., Aguirre-Calderón, O. A., González-Tagle, M. A., Pompa-García, M., & Aguirre-Salado, C. A. (2012). Modeling susceptibility to deforestation of remaining ecosystems in North Central Mexico with logistic regression. Journal of Forestry Research, 23(3), 345–354. http://doi.org/10.1007/s11676-012-0230-z
Sáenz-Romero, C., Lindig-Cisneros, R. A., Joyce, D. G., Beaulieu, J., St. Clair, J. B., & Jaquish, B. C. (2016). Assisted migration of forest populations for adapting trees to climate change. Revista Chapingo Serie Ciencias Forestales Y Del Ambiente, 22(3), 303–323. http://doi.org/10.5154/r.rchscfa.2014.10.052