Psathyrella spadicea, commonly known as the chestnut brittlestem, is a species of agaric fungus in the family Psathyrellaceae. The fungus was originally described by German mycologist Jacob Christian Schäffer in 1783 as Agaricus spadiceus. Rolf Singer transferred it to the genus Psathyrella in 1951, in which it is classified in the section Spadiceae. The mushroom is edible.Psathyrella spadicea is found in Europe and North America.