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(Armillaria mellea), a hymenomycetous mushroom of the family Tricholomataceae. The top of the cap is grayish yellow with dark scales; the underside has white gills. Young mushrooms have a white membranous cover on the cap’s underside. As the mushroom matures, the cover opens and remains in the form of a ring on the long, straight stem. Honey mushrooms grow in clusters on tree stumps, fallen trees, and roots. They also live as parasites on the base of living trees. Decayed wood containing the mycelia of honey mushrooms glows in the dark. The mushrooms are edible.