(Agrocybe aegerita) Pioppino mushrooms grow on decaying tree stumps or beneath popular trees, this mushroom is a popular food ingredient in both Asia and southern Europe. Also known as Black Poplar mushroom named from its growing habitat around poplars, the Pioppino develops a light brown colored cap sprouting from a thin white stem. Rings of the fungus membrane surround the stem and eventually fall to the ground as spawn. Firm in texture, the Pioppino provides a mildly nutty flavor when cooked and can be added to complement a variety of rice, risotto, and meat dishes.