Russula cyanoxantha, I'm pretty sure. The oldest specimen here has a cap 7.5 cm across. Its stalk is 3 cm long and 2 cm wide, slightly larger at the base. The gills are white, close, and slightly oily. They're not brittle. They are adnate and slightly decurrent. A few of them fork near the margin. The cap is dry and a lovely hue of green-gray especially in the center. The margins are striate and white. The spore print was white, and the spores were mostly round with little bumps. They were about 6 μ across.
Arora lists R. cyanoxantha as edible and choice, certainly the beetles think so, as they were everywhere. I didn't try this one. Maybe next time.
As a side note, I was attacked by my first horsefly of the year today. I'm curious to see if there is a correlation between this russula and them next year.
"A Book of the seasons--each page of which should be written in its own season & out of doors or in its own locality wherever it may be"--Thoreau's journal, June 11, 1851