The phialide (/ˈfaɪ.əlaɪd/ FY-əl-yde; Greek: phialis, diminutive of phiale, a broad, flat vessel) is a flask-shaped projection from the vesicle (dilated part of the top of conidiophore) of certain fungi. It projects from the mycelium without increasing in length unless a subsequent increase in the formation of conidia occurs.
It is the end cell of a phialophore.
References
Phialide Wikipedia(Text) CC BY-SA