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.