Pileus fleshy, firm, broadly convex, becoming depressed in the center, sometimes umbonate, latericeous (330) to reddish-terracotta (100, t. 2) zoned with darker tones, fading with age, dry, covered with a short tomentum somewhat like the pile on plush, at length nearly glabrous in the center and sometimes areolate, 5-15 cm. broad, margin involute for some time, then merely arched, sometimes flexuous in old plants, at first striate with darker streaks; gills pale-buff (64), soon becoming tinged with mineral-brown (339) and reflecting madder-brown, mostly entire, close, decurrent by a tooth, 3 mm. broad; stem dull pale reddish-terracotta, usually paler than the pileus, sometimes spotted with reddish-brown, becoming darker where bruised, nearly equal or abruptly, smaller at the base, glabrous or merely with a whitish bloom, firm, stuffed, becoming hollow in the mature plant, up to 4.5 cm. long, 1-2 cm. thick; flesh tinted with terracotta; spores whitish, subglobose, strongly echinulate, 7-8 µ; latex white, unchanging, astringent, then very acrid, abundant.
Holotypus: Burlingham 1, 1907 (NY)
Published type studies: Hesler & Smith (1979), N. Amer. Spec. Lactarius: 212
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