Suillus tomentosus  (Kauffman) Singer (1960)

This is a common North American Suillus. I have seen it abundantly in late Summer to early Fall in the Rockies and California. It seems to be associated to 2-needle Pines -- Lodgepole Pine in the mountains and to Bishop Pine on the California coast. While the biggest fruiting is early in the season, locally I also see sporadic flushes in late Winter and the Spring, as well. There is a superficial resemblance to the European Suillus variegatus, which also is associated with 2-needle Pines, but that species does not turn blue on bruising.

Sometimes upper stipe is slightly reticulate