Dick and Snell
Pileus: 14 - 20 cm broad, convex, broadly parabolic to planar; margin straight and even when young, becoming uplifting with age; surface dry to moist, at times appearing viscid, at first with scales, appearing tomentose, frequently cracking (areolate), becoming smooth with age, unpolished; brownish yellow on disc becoming greyish yellow on margin, scales darker (brown) than cap; context 3.5 - 4.5 cm at junction of stipe; firm, moist, pallid, buff to ivory yellowish white, blueing when bruised; taste very bitter; odour indistinct.
Stipe: 10 - 13 cm X 2.5 - 4.0 cm wide at apex, 4.0 - 5.0 cm wide at base; equal to clavate, at times ventricose, tapering upwards; surface dry, at first with minute scales then becoming somewhat smooth; colour buff ivory to yellow on apex, darkening to reddish brown toward base; yellow reticulations on apex; context solid, firm, pallid to pale yellow, reddish brown at base, instantly changing to blue when bruised.
species has a solitary to scattered
habit and is easily recognized in these forests because of its large
and robust stature, very bitter taste, blue staining when bruised
and absence of red colours on the stipe.
Dick, E.A. and W.H. Snell: 1968. Some Boleti from Alaska. Mycol. 60: 1204 1210.
Thiers, H. D. 1975. California Mushrooms: A field guide to the Boletes. Hafner Press. pp. 261.