Russula aeruginea  Fries (1863)                                 *Collections: California, Oregon, Alaska

This Russula seems to have a rather Cosmopolitan distribution in the Northern Hemisphere.  Primarily it is associated with Birch (Betula) in the low elevations and Fir (Abies) in the montane regions. It is one of the most abundant mushrooms in the Sierra/Cascade range in late Summer and early Fall.

Alaskan collections under Betula papylifera

Sierra Nevada Collections