Noun
In certain fungi, a flask-shaped cavity from the surface of the inner walls of which spores are produced.
Source: Webster's dictionaryThe diverse conidia and conidiophores sometimes develop in asexual sporocarps with different characteristics (e.g. aecervulus, pycnidium, sporodochium). Source: Internet
The pycnidium is a globose to flask-shaped parenchymatous structure, lined on its inner wall with conidiophores. Source: Internet