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Mycena aurantiomarginata, commonly known as the golden-edge bonnet, is a species of fungus in the family Mycenaceae. It has a widespread distribution, common in Europe, and North America, and also having been collected in North Africa, Asia, and Central America. The fungus is saprobic, and produces mushrooms that grow on the floor of coniferous forests. The mushrooms have a bell-shaped cap up to 2 cm (0.8 in) in diameter, a slender stem up to 6 cm (2.4 in) long with yellow to orange fibrils at the base, and characteristic bright orange color of their gill edges. A microscopic characteristic is the club-shaped cystidia covered with numerous spiky projections that resemble a mace. The edibility of the mushroom has not been determined. A 2010 publication reported the discovery and characterization of a novel pigment named mycenaaurin A, isolated from the fruit body of the mushroom. The pigment is likely responsible for the color of the mushroom, and it has antibiotic activity that may function in nature to prevent certain bacteria from growing on the fruit bodies.