California grape with ripe fruit.
Crematogaster? Not a good photo.
Toyon with fruit.
California black oak leaf
Oakmoss (with other lichens).
California buckeye without leaves and with ripe fruit.
Maybe a Ceanothus?
Wasp gall a golden cup oak twig
Live oak on the Flume Trail
Feather found next to a rocky outcrop covered in bird droppings. It's a local high point on the trail and houses a USGS survey marker, and looks like the sorts of places that vulture, raptors and ravens enjoy sitting.
Conical wasp galls on the underside of a valley oak leaf (not the multi-pointed gall pictures in the center).