Lactifluus corrugis (formerly Lactarius corrugis), commonly known as the corrugated-cap milky, is an edible species of fungus in the family Russulaceae.
The species was first described by American mycologist Charles Horton Peck in 1880.
The brownish-red cap is wide, and is usually dusted by a light bloom (turning dark when touched). The gills are light yellow and leak white latex, which stains brown. The stem is long and . The spore print is white.
It resembles Lactifluus volemus, the latex of which also stains brown. Additionally, L. hygrophoroides has a pinkish-orange cap.
The mushroom can be found under oak trees in eastern North America between July and September.
L. corrugis is considered a choice edible mushroom.