This species can be considered vulnerable under the criteria C2i. Because it is distributed in cloud forest that has a decline continues observed, estimated and projected Ponce-Reyes et al. (2012) and its host Quercus oleoides has populations fragmented by its commercial importance. Currently Tylopilus subniger has approximately 30 potential locations, therefore, has fewer than 10.000 individuals, which will decrease.
Pileus first black, later violet brown, dry and subtomentose. Hymenophore tubulose, pores and tubes white then more greyish or brownish. Stipe fuligineous or dark chocolate, rarely staining yellow at the base, the reticulation reaching down the to lower third of the stipe, more rarely visible only in the upper two thirds, generally whit pseudorrizha.
Context. Spores fusoid whit suprahilar depression or applanation, cystidia ampullaceous more rarely cilindrycal or clavate to fusoid.
The distribution San Jose and Cartago from Costa Rica and Huatusco and La Banderilla from Mexico. Altitud 1500-2300m.
Mexico, (F. XAL)Veracruz, Rancho la Pomarrosa, Km. 4 al Suroeste de Banderilla
FJ. Anell 11916 June 1984. Costa Rica, San José a few kms E of la Perla, about 2000m, June 1983, Gomez20627 (F), El Jardín, 8 june 1984, R. Singer B-14555-a F (Type). Cartago: La chontla 17 june 1983, R. Singer B-14387 (F). In recent dates 2016, 2017. Dra. Montoya has collected specimens in Quercus Oleides in Huatusco.
Solitary. In cloud forest and under oak. Altitude 1500-2300m. presumably by ectomycorrhizal.
Rancho la Pomarrosa, Km. 4 to the southwest of Banderilla, where the species was described by type is already very fragmented since there are currently crops and only patches remain and the species has not been found again in the mesophilic mountain forest. In Costa Rica it has been collected in Quercus oleoides and according to the iucn this species is almost threatened by economic importance
Singer R, García J, Gómez LD (1991) The Boletineae of Mexico and Central America III. Nova Hedwigia, Beihefte 102:1-99.
Ponce-Reyes R, Reynoso-Rosales HV, Watson EMJ, VanDerWal J, Fuller AR, Pressey LR, Possingham PH (2012) Vulnerability of cloud forest reserves in Mexico to climate change. Nature Climatic Change. 2:448-452. DOI:10.1038/NCLIMATE1453