Photo: © Steve Trudell
Boletus coniferarum
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.

Tubes: Notched at first, then decurrent; pores close and small 2 - 2.5 per mm; edges even, yellow to vivid yellow, when bruised blueing at first then eventually becoming brown.

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.

Microcharacteristics: Spore print dark olive brown; spores 13 - 14.5 X 4.4 - 5.2 µm, smooth, hymenial cystidia present, fusoid and ventricose.

Comments: This 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.

Further Reading:

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.