Butyriboletus querciregius
Mycologia 106(3): 476. 2014.
Common Name: butter bolete
Misapplied name: Boletus regius Krombholz
For description see Arora & Frank.
Solitary to scattered to gregarious in leaf litter under oaks, primarily coast live oak (Quercus agrifolia); fruiting fall in central coastal California; common some years.
Edible and excellent with a firm texture.
Butyriboletus querciregius can be distinguished by its pinkish red cap when young, yellow stipe that quickly bruises blue, yellow flesh, and association with oaks. Another fall fruiter, Butyriboletus autumniregius, could be confused with Butyriboletus querciregius, but it grows in conifer or mixed conifer/hardwood forests in coastal areas, and the Sierra Nevada and Cascade ranges. Butyriboletus autumniregius is probably associated with Douglas fir (Pseudotsuga menziesii).
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. (Protologue) (PDF)
Siegel, N. & Schwarz, C. (2016). Mushrooms of the Redwood Coast. Ten Speed Press: Berkeley, CA. 601 p.
