The rhubarb-colored stem and the brownish color of the young hymenium are the distinguishing features of this species. The glandules occur also on the tubes. The species is rare. Peck, Boleti of the U.S.
Not seen by Professor Peck since its discovery in 1878.
Spores when first dropped are olive-green on white paper, but the green hue soon changes to brownish-ochraceous. Peck, 44th Rep. N. Y. State Bot.
Ontario, Prof. Dearness (Lloyd, R. 4).
B. al´bus Pk.—white. Pileus convex, viscid when moist, white. Flesh white or yellowish. Tubes plane, small or medium, subrotund, adnate, whitish, becoming yellow or ochraceous. Stem equal or slightly tapering downward, both it and the tubes glandular-dotted, white, sometimes tinged with pink toward the base. Spores ochraceous, subfusiform, 8–9×4µ.
Pileus 1.5–3 in. broad. Stem 1.5–3 in. long, 3–5 lines thick.
Woods, especially of pine or hemlock. New York, Peck; New England, Frost.
This species is easily known by its white pileus, but its color is lost in drying. Sometimes the fresh plant emits a peculiar fetid odor. Peck, Boleti of the U.S.
B. granula´tus—granula, a granule. Pileus convex or nearly plane, very viscid or glutinous and rusty-brown when moist, yellowish when dry. Flesh pale-yellowish. Tubes short, adnate, yellowish, their mouths simple, granulated. Stem dotted with glandules above, pale-yellowish. Spores spindle-shaped, yellowish-orange, 7.5–10×2–3µ.
Pileus 1.5–4 in. broad. Stem 1–2 in. long, 4–6 lines thick.