: First record of a truffle .

(order Boletales) is a diverse genus of epigeous, mushroom-forming fungi native to temperate forests across the Northern Hemisphere; however, some species are also present in areas where Pinaceae has been introduced in the Southern Hemisphere. Unlike the closely related genus , there are no described hypogeous, sequestrate species of . Here, we describe , the first known species of the genus with hypogeous, sequestrate sporocarps. Collections were made on Marys Peak in Benton County, Oregon, USA, at an elevation of 800 m in forests dominated by var. . The peridium is white, quickly staining pink to purple-reddish where bruised or cut. The gleba is pale yellow when young, becoming purple with maturity, and the basidiospores are obovoid, light yellow in KOH, and amyloid in Melzer's reagent. Multilocus molecular phylogenetic analyses support the placement of among the specialists in the spectabilis group of . Although and are sister genera, does not occur on Marys Peak or elsewhere in western Oregon. , therefore, represents both an independent origin of the hypogeous, sequestrate sporocarp within the Boletales and an independent host shift between and within the genus .