I found some in the same area around same time, noted the yellow gills on younger species. C. thiersii is found in mountains according to MotRC, but this is very close to coast and visually very similar.
ravenoftheisle
2019-01-00
Wed Jan 30 2019 12:12:10 GMT-0800 (PST)
United States of America, California, Wilder Ranch State Park, Santa Cruz, CA, US