They are situated in the receptacle and open by a small ostiole. The actual attractive substances come from the ostiole. The conidia are released through a small opening at the apex, the ostiole. Their only connection with the outside is through a small pore called ostiole. The spore sac contains an ostiole, a small opening near the apex. The ascomata are light brown in color, but darker around the ostiole. The wall is thin and fragile and is yellow to brown, with a short ostiole. The ascomata are immersed and flask-shaped, measuring up to , including a short ostiole. The asci elongate into the ostiole, and discharge the ascospores outward. Female wasps squeeze their way through the ostiole into the interior of the syconium. Setae mostly occur around the ostiole, but may grow anywhere on the pycnidium. They are surrounded by two crescent-shaped cells at right angles to the ostiole. When the outer bracts meet, they form the ostiole by interlock. It is closed off from most organisms by the ostiole, fringed by scale-like bracts.