About Gymnopus brassicolens (Romagn.) Antonín & Noordel.
Commonly called the cabbage parachute, Gymnopus brassicolens gets its name from its strong smell of rotten cabbage. It can be told apart from similar mushrooms by its buff-colored gills, and a distinctly tapered, bicoloured stipe that is orange-yellow at the top and dark red-brown or black at the base. Its cap is either convex or flat, measures 15–45 mm across, and has an undulating margin. The cap is reddish or yellow brown, often translucently striate, and fades in color toward its margins. Gymnopus brassicolens generally produces fruiting bodies in summer and autumn, growing among leafy debris from hardwoods and conifers, including beech, oak and birch. In California, this species grows especially under redwood trees, and fruits from late fall to winter there.