involucre

A group of one or more whorls of bracts beneath a flower or flower cluster.

In botany, any collection of bracts round a cluster of flowers.

In anatomy, a membranous envelop. as the pericardium.

3, In zoology, an involucrum.

A whorl or set of bracts around a flower, umbel, or head.

A continuous marginal covering of sporangia, in certain ferns, as in the common brake, or the cup-shaped processes of the filmy ferns.

The peridium or volva of certain fungi. Called also involucrum.

Conspicuous bract, bract pair or ring of bracts at the base of an inflorescence.

a highly conspicuous bract or bract pair or ring of bracts at the base of an inflorescence