noun, plural ex·o·pe·rid·i·a [ek-soh-puh-rid-ee-uh] /ˌɛk soʊ pəˈrɪd i ə/. Mycology.
Examples from the Web for exoperidium
Exoperidium revolute, cut to about the middle in eight to ten segments.
Exoperidium cut in six to ten segments about half way, the limb deeply saccate.
Fleshy layer closely attached, very light in color, usually smooth on the limb of the exoperidium but cracked on the segments.
The outer coat or exoperidium recurved, segments acute at the apex, eight to twelve segments divided to about the middle.
Exoperidium cut beyond the middle into seven to nine acute segments.