Collection location: Albion, Mendocino Co., California, USA [Click for map]
First time these were id’ed up there, and pretty much no one had heard of these. But they were pretty easy to id, with an acrid taste, white gills, and a pale colored pileus, they were the first species in the key. Theirs mentions that for acrid taste and white gills, only these and R. cremoricolor have a pale colored pileus. With the grey tones here, and no yellow tones, they aren’t R. cremoricolor.
These were quite popular this year, with lots found. Found mostly buried in pine needles, in among the rotting logs. Rare most years I guess, and overlooked, but very common this year.