Subgenus: Hydnum subgenus Rufescentia
Section: Hydnum sect. Rufescentia
Subsection: Hydnum subsect. Tenuiformia
Group: Hydnum umbilicatum group sensu Niskanen (H. cf. umbilicatum as used in Niskanen et al.)
This name has been misapplied to Hydnum oregonense. The type is from New York; there are are probably 3 other species hiding under this name:
The intraspecific variation (nine substitutions and indel positions, >1.5% between the two most divergent specimens) observed in H. cf. umbilicatum is so large that H. cf umbilicatum probably represents a species complex. The group can tentatively be divided into four taxa that would seem to have a non-overlapping distribution: Eurasia, central Europe, eastern North America, and western North America.
Niskanen, et al. 2018. “Identifying and naming the currently known diversity of the genus Hydnum with an emphasis on European and North American taxa.” Mycologia https://doi.org/10.1080/00275514.2018.1477004.