Lactarius indigo, also known as Indigo milk cap, is a medium to large indigo blue mushroom. The sticky cap surface has a silvery sheen. It grows solitary or grouped on forest soil, summer and fall.
Firm, convex with a depressed disc and inrolled margin at first, becoming shallowly funnel-shaped. The surface is smooth, pale to light- or purplish-blue when fresh, later greyish or silvery. Gills
Adnate to slightly decurrent and crowded close together. Their colour is an indigo blue, becoming paler with age or staining green with damage. Stem
cylindric, hard, hollow. The surface is sticky and sometimes spotted. Spores
Similar species Clitocybe nuda
is to some degree a look-alike.