Described as Boletus abieticola (Thiers 1975), from a California, USA collection; later transferred to the genus Butyriboletus (Arora & Frank 2014).
Butyriboletus abieticola is a locally common species, often growing with true firs in high elevation forests in the Sierra Nevada of California, north into Washington in the Cascade Range.
Most populations are known from high elevation fir (Abies spp) forests in the Sierra Nevada, Siskiyou and Cascade Range of California, and the Cascade Rang in Oregon and Washington (iNaturalist 2020, Arora & Frank 2014). Also occasionally seen on the Northern Californian and Oregon coast (Siegel & Schwarz 2016).
Population is fairly widespread; population appears stable, but not enough data is available showing trends of this species.
Population Trend: Uncertain
Ectomycorrhizal, associated with Abies sp. especially Red Fir (Abies magnifica) in high elevation forests of the Sierra Nevada and Cascade Range, occasional to rare in coastal forest in northern California and Oregon with Grand Fir (Abies grandis). Fruiting in the summer and early fall.
Prolonged droughts and decades of fire suppression have drastically altered the high sierra forest, leading to thicker, denser, Abies dominated forest. As a result, hotter, stand replacing fires (rather than patchwork and understory burns) are commonplace, altering appropriate habitat drastically, and making it ill-suited for this species.
Fuels reduction in mid to high elevation Abies forests.
More data on populations and trends of this species.
This species is edible, and is often collected for food.
Arora, D. & Frank, J.L. 2014. Clarifying the butter Boletes: a new genus, Butyriboletus, is established to accommodate Boletus sect. Appendiculati, and six new species are described. Mycologia 106(3): 464-480.
Siegel, N. and Schwarz, C. 2016. Mushrooms of the Redwood Coast. Ten Speed Press: Berkeley, CA. 601 p.
Thiers, H.D. 1975. California Mushrooms—A Field Guide to the Boletes. Hafner Press: New York, NY. 261 p
Wood, M.G. and Stevens, F.A. 2020. MykoWeb; California Fungi. https://www.mykoweb.com/CAF/species/Butyriboletus_abieticola.html