aecidia 🔊 Listen to this < /iˈsɪd i ə/. Mycology. an aecium in which the spores are always formed in chains and enclosed in a cup-shaped peridium. File:Puccinia aecidia 0482.jpg – Wikimedia Commons Aecidia van Puccinia coronata Corda photo – An De Wilde photos at Cone Scales Of A Closed Cone Stock Photos & Cone Scales Of A Closed j^a/ Share Facebook Twitter Google +