Either a rogue (jay-planted?) Q. kelloggii well outside any nearby grove, or more likely, a live oak-black oak hybrid (photo taken in late January)
This is a hybrid oak with Q. kelloggii and Q. agrifolia parentage. Note that the architecture and bark more resemble Q. kelloggii, while leaves are closer to Q. agrifolia, although the leaves carry the larger size and longer spiny lobes of the Q. kelloggii.
Agrifolia x kelloggii hybrid. Evergreen, thin new leaves, deeply loved for agrifolia. Lots of adults of two species in vicinity
The Quercus Engelmannii (Engelmann Oak) has small bits of yellow-green moss along the branches of it tree.