‘posted by matt greene at 8:55 AM: The widely variable coloration of boletes has made their identification very difficult for me to learn. I’m going to call this B. dryophilus a.k.a. “oak loving bolete”. Identifying characteristics include the blueing reaction of the irregular yellow pores when handled, the pinched and then swollen base of the stalk, and the red cap cracking with age and becoming tinged with olive. The stalk also gradates from red to yellow. I’ll do a spore print next time I find one – it should show brown or olive-brown eliptical spores. B. dryophilus is the most common bolete in Los Angeles county, and associates with coast live oak. It is supposedly edible (and bland). The cask fungus Hypomyces chrysospermum parasitizes this species more readily than any other; I was uncertain of my identification until I found one half encased in a shell of white powder.’