Fruiting body a sporangium. Peridium consisting of three layers, the outer layer thin, brittle, and cartilaginous, the middle layer thick and limy, and the inner layer membranous. Columella absent. Capillitium reticulate, in part limeless and in part filled with globular lime, badhamioid, connected to the inner layer of the peridium, often forming a pseudocolumella. Spores in mass dark brown to nearly black.
Two species have been described for the genus Leocarpus (Lado 2001). One of these is relatively common and widespread throughout the world, while the other is known only from Australia.