An apophysis (a swelling on the underside of the spore sac) is often present. The inner peridium is a spore sac. It is lighter in color than the spore sac, and up to high. The spore sac is supported by a small radially wrinkled stalk. The spore sac contains an ostiole, a small opening near the apex. The spore sac is stalked, and roughly spherical, with a diameter of about . In maturity, the spore sac ruptures to release the spores.