Stemless gilled mushroom that gets as big as a hand. Gills are white/light. Cap surface is tan/brown.
On red alder in mixed forest about 3 miles from the sea at 500' elevation.
This has been fruiting all through February, which has been wet and with temperature in the 30s and 40s. There's some debate about whether to call this P. ostreatus or P. pulmonarius, but as it's fruiting in the winter/cold season I'll call it ostreatus. It's good to eat (cooked).