noun Mycology.
the membranous envelope that encloses the base of various mushrooms formed when the velum ruptures.

1745–55; < Latin: covering, akin to volvere to roll, wrap

volvate [vol-vit, -veyt] , adjective
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World English Dictionary
volva (ˈvɒlvə)
n , pl -vae, -vas
botany a cup-shaped structure that sheathes the base of the stalk of certain mushrooms
[C18: from Latin: a covering, from volvere to wrap]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
volva   (vŏl'və, vôl'-)  Pronunciation Key 
A cuplike structure around the base of the stalk of certain basidiomycete fungi.
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