variable and complex flask-shaped asexual reproductive structure, or fruiting body, in fungi (fungus) (kingdom Fungi) of the phylum Ascomycota; also a male sex-cell-producing organ in the order Uredinales (rust fungi). It bears spores (spore) (conidia) variously known as pycnidiospores, oidia, or spermatia. The spores are liberated through an opening (ostiole) in the pycnidium.