Collection location: Los Trancos Preserve, Palo Alto, Santa Clara Co., California, USA [Click for map]
Found lots of these up there this past week. Most were in these tight clusters, bursting up from the duff, under live oak. I have more photos, but I’ll stop here. The cap colors were fairly variable, showing different amounts of grey, purple, and off white. The gills also show color variation, which seems to be linked to age. Starts bright white, and then the gills darken to light grey, and then darker grey with blackish stains.
At the Santa Cruz Fungus Fed. setup for the Fair on this weekend (Jan 13-14), I got into a discussion about why these aren’t T. portentosum. You have to read Kris Shanks notes on this species for that question. But the growth under live oak (instead of conifirs), the lack of yellow in the stipe and gills in age, and the purple tomes in the cap can separate these two species.