Collection location: Los Trancos Preserve, Palo Alto, Santa Clara Co., California, USA [Click for map]
Id’ed from Kris Shanks section of the Agaricales of CA (Tricholoma). These were assumed to the be same as T. portentosum for years, but now a separate species. They could easily be mistaken for E. bloxami, but the stipes are firmer, and whiter. Oh, yeah, and the white spore print. Found a bunch in one place, all of them mostly burried, with only small parts of the caps showing.