I spotted these huge mushrooms today in the woods outside my place. From what I gather, these are Dryad Saddle mushrooms (AKA Pheasant Back mushroom, for the pattern on top that resembles pheasant feathers). If that's really what they they are, they're edible. At this size, though, they'd be too tough to bother with. Apparently large ones can be used for broth. Taste is described as sort of fresh cucumber/watermelon rind. Doesn't sound particularly good, so I think I'm gonna pass.