volva

noun

vol·​va ˈväl-və 

ˈvȯl-

: a membranous sac or cup about the base of the stipe in many gilled fungi (such as agarics)

Illustration of volva

Word History

Etymology

New Latin, from Latin volva, vulva integument — more at vulva

First Known Use

circa 1753, in the meaning defined above