Source : Webster's Revised Unabridged Dictionary (1913)

Pycnidium \Pyc*nid"i*um\, n.; pl. {Pycnidia}. [NL., fr. Gr. ?
   crowded.] (Bot.)
   In certain fungi, a flask-shaped cavity from the surface of
   the inner walls of which spores are produced.

Source : WordNet®

pycnidium
     n : flask-shaped asexual structure containing conidia
     [also: {pycnidia} (pl)]