Roridomyces roridus, commonly known as the dripping bonnet or the slippery mycena, is a species of agaric fungus in the family Mycenaceae. It is whitish or dirty yellow in color, with a broad convex cap 5– in diameter. The stipe is covered with a thick, slippery slime layer. This species can be bioluminescent, and is one of the several causative species of foxfire.