Lactarius indigo has a zonate blue cap, blue gills and a blue stem with circular pits. Turns silvery with age. Gills are adnate to slightly decurrent, closely spaced and develop a creamy-yellowish cast with age. Latex is bright neon blue and turns greenish slowly. All parts staining greenish with handling. Cream spores. In oak/pine woods during summer and autumn. Mild taste, slowly becoming mildly acrid. Edible.