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.
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