I'm sure people will correct me if I'm wrong, but I wanna say these look like oyster mushrooms. Oyster mushrooms are pretty common in the PNW. What a beautiful find.
Yeah, with all the surrounding foliage, it's kind of hard to tell what it's growing out of. Please excuse me, as I am a novice in the mycology world, but is a circular umbrella shape not a characteristic found in oyster mushrooms?