SF Peninsula Fungi - symbiote
Russula sp. fluoresces blue when illuminated by UV light.  That's the blue area right of center, and the UV flashlight itself is seen in the lower right corner.   Monte Bello OSP.

Russula sp. fluoresces blue when illuminated by UV light. That's the blue area right of center, and the UV flashlight itself is seen in the lower right corner. Monte Bello OSP.

FungiMonte BelloPlacesP1150712