Found at Landau Economics facing Serra Mall. Growing scattered along a wood chip-covered area under a mixed planting of pines (lacebark pine, P. bungeana, closest but also P. muricata and P. canariensis), London plane (Platanus), and oaks. Flesh white, not changing color after cut; pore surface yellow in young specimens darkening to yellow-brown. Specimens have dried due to age, but leaves firmly stuck to caps indicate glutinous surface when wet.
This keys to S. fuscotomentosus in Desjardin, Wood, and Stevens 2015. It matches Arora 1979's S. acerbus with non-scaly and more viscid caps (but differs in host, which was not Monterey pine), but the two species appear to intergrade according to Arora.
End of blooming
SLAC Corridor two or three in the grasses
Streetside near our neighbors driveway. A total of 14 adults and sub-adults