King Bolete (Boletus edulis) also called: Cep, Porcini, Steinpitz.

Description: 3 to 13 inches broad, thick and firm flesh, does not blue when bruised, except occasionally slight bluing near tubes. 
Convex to broadly convex when young, dry surface that is sticky( viscid) when young, cracking into plaques as it ages. Color 
varies: bread crust or biscuit brown, yellow brown, cinnamon to reddish brown to dark red, but remains whitish to pink tint under 
duff and pine needles. Thick stipe of young bolete large in relation to cap, larger below typically, as bolete ages, stalk and cap 
become proportional. Pores white, pallid when young, becoming yellow to olive yellow or brown and do not blue when bruised. 
Spore print white at first then olive brown spindle shaped to elliptical and smooth. Various sub species vary in color but brown 
to reddish brown most common.

Delicious and generous mushroom, that may be sliced and dried, eaten immediately and gourmet with any dish. Eat entire 
fruiting body.

King Boletes are susceptible to worms and maggots.  Finding them before the worms is difficult, but I find the worms as 
delectable as the mushroom.  Fry, boil, saute--worms and all.

King Bolete found in Montana along stream in a National Forest campground near Polaris.

King Bolete with whitish to pallid pores filled with pith, will eventually turn yellow to olive yellow.