Collection location: Howarth Park, Santa Rosa, Sonoma Co., California, USA [Click for map]
Pileus: olive green, not viscid.
Gills: Notched, greenish gray, thin, close.
Stipe: Abruptly bulbous, lavender at apex, yellowish below.
Arora describes a C. scaurus group that this might fit into. Associated with Douglas fir, bay and oak.
I agree with Joshua that C.glaucopus group is a better fit for this. I didn’t get any good shots of the pileus. I’ve added a closeup of the best representation of the pileus that I got. It does appear streaked and possibly fibrillose.