I think this is oyster rather than late fall oyster but let me know please if I've missed some technical details.
Growing directly out of dead hardwood. Spore print is lilac-pink.
Fungi (yellow) was approx. 12 feet from the ground. The Coastal Live Oak appeared to be unhealthy (Dead limbs, peeling bark )
Very large clumps just below the dam. On dead either alder or cottonwood
Nov 17 Giant mushroom ... like a colony of mushrooms growing on top of each other ... growing on a dead tree adjacent to the bike path it was at least 1 foot in diameter
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.