Possibly Pleurotus ostreatus
Found along a path in Mt. Park
It was growing on a Dead log not a tree

Related species:
Pleurotus ostreatus - spore print white to lilac-gray
Pleurotus populinus - the "aspen oyster- and
Pleurotus pulmonarius - The summer oyster
Pleurocybella porrigens is white spored -- called Angel wings


Click Here for info on Pleurotus ostreatus
Click here for info on Pleurotus pulmonarius
Click here for info on Pleurotus ostreatus

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Dick B. said: " the common Pleurotus in the NW are P. populinus and P. pulmonarius. P. pulmonarius is said to fruit on a variety of hardwoods and conifers and I bet you can figure out what P. populinus fruits on.
I have not seen a spore print of a Pleurotus with white spores although some species spore color is said to be variable including white. Pleurocybella porrigens is white spored and can look very similar to a small or young Pleurotus".--Dick

My note: Pleurocybella porrigens is also called "angel wing". Some references indicate that Pleurocybella porrigens is edible; however, other references indicate that there are reports from Japan indicating that they are toxic.

Mike P. said: "I am no expert on P. ostreatus, but it looks like it to me -- unless it's very thin, in which case I would say angel wings. Dead wood is a primary habitat for oyster mushrooms, and it's very commonly found on dead wood, ranging from dead trees to dead branches or logs.

Paul W. said "Looks like an oyster to me. Oysters grow on dead wood so no problem there. The light changes on some of the pics but I assume all the mushrooms are the same color in real life. Professor Bishop might say the spores are more light lavender than white. He might also say that the scientific name for the oyster in the PNW is no longer P. ostreatus".