In the Uredinales, stage 0, consisting of the male fertilizing elements (pycniospores) and female elements, the flexuous hyphae. (Pl. pycnia.) 
Also called a spermagonium. A fruiting body of the rust fungi that produces small spores called pycniospores or spermatia which cannot infect plants but function as gametes or gametangia.
a flask-shaped or conical sporangium of a rust fungus, which develops below the epidermis of the host and bears pycniospores.