vesicle
thin sac in which zoospores are differentiated and released; the bulbous head terminating the conidiophores of Aspergillus;
structure formed by endomycorrhizal fungi within living cells of the root
(left: zoospores of Pythium undulatum form in a vesicle just outside the sporangium; center: SEM of Aspergillus flavus; right: endomycorrhizal vesicles in alfalfa root stained with trypan blue)