- volute spring,
Origin of volva
Examples from the Web for volva
Volva, a wrapper or envelope, which in the young stage completely surrounds the plant, same as universal veil.
Perhaps no part of the plant is more variable than the outer veil or volva.
The volva is a feature of great importance in the study of the Agaricini, of the subgenera Amanita, Volvaria, etc.
Ring and volva present in some species, ring alone others, both absent in others; gills adnate, adnexed or free.European Fungus Flora: Agaricaceae|George Massee
The volva is evanescent in both, leaving traces of its existence in concentric ridges at the base, and part way up the stem.