Native oakland oak tree
Baby snail in my yard
Some sort of birds nest fungus.
Sadly it was not being cooperative and showing its face or any gonopods.
Probably H. nigrescens, Oak woodland version of H. conica.
Appears to be a little self-seeded seedling.
Ok, this is the 3rd time I've seen this. I'm convinced it's not B. edulis, so time to make a concerted ID effort. No staining reaction, smell pleasant, somewhat porcini-like. Cap viscid when wet but I don't recall it being that slimy on previous, drier encounters. Seemed to be growing under huckleberry, but there was a pine some distance up the hill, and some nearby bays and possibly chinquapin and maybe some kind of alder. I didn't notice any particularly large oaks nearby.
Observed in Huckleberry Botanic Preserve, Oakland, CA, USA. Cap about 5 cm in diameter.