Cannon Ball fungus

This tiny gasteromycete is known for its cannon-like ability to eject a spore mass (peridiole) a considerable distance, sometimes many feet. Though rarely seen because of its size, it is probably common and there are reports of it fruiting in sufficiently large numbers in mulched plantings to cause problems for homeowners, masses of the pinhead-sized, dark peridioles adhering to the paint surfaces of cars and buildings. Do not confuse the inflated, translucent inner peridium, often seen on the cup lobes for the gleba mass (peridiole). The "balloon" indicates that the peridiole has already been shot off.