This all blood-red bolete has moist, convex to flat cap 2 to 6 inches across, with yellowish flesh. The tubes are sunken around the stalk.
Frost's Bolete, Older Specimen, from below
Note how much of the red color has been washed away by heavy rain, as opposed to the sculpture (top), modeled after a fresher specimen, and photo of the fresher
mushroom below.
The stalk is 1-5/8 to 4-3/4 inches long, 3/8 to 1 inch thick, covered with a web pattern called reticulation.
Frost's Bolete, Young Specimen, from below
Note the amber-colored drops of condensed water decorating the red pore surface. This is the best way to tell this mushroom apart from similar, closely related species.
The spores are olive-brown.
Then entire mushroom turns blue instantly when you bruise or cut it.
Some people have gotten away with eating this bolete, which reportedly isn't particular tasty, while others experience gastrointestinal poisoning (vomiting and diarrhea), although they may have eaten closely related toxic species. It's certainly one I'd never be tempted to try!
I thought the ones that turn blue right away when cut were the good ones!