High up on dead Coast Live Oak branch.
I'm not sure about this. Biggest oyster mushrooms I've ever seen.
common edible mushroom and white-rot fungi on damp wood
Pleurotus is a genus of gilled mushrooms which includes one of the most widely eaten mushrooms, P. ostreatus. Species of Pleurotus may be called oyster, abalone, or tree mushrooms, and are some of the most commonly cultivated edible mushrooms in the world.Pleurotus fungi have been used in mycoremediation of pollutants such as petroleum and polycyclic aromatic hydrocarbons.