Hypertext Webster Gateway: "involucrum"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Involucre \In"vo*lu`cre\ (?; 277), n. [L. involucrum a covering,
wrapper, fr. involvere to wrap up, envelop: cf. F. involucre.
See {Involve}.] (Bot.)
(a) A whorl or set of bracts around a flower, umbel, or head.
(b) A continuous marginal covering of sporangia, in certain
ferns, as in the common brake, or the cup-shaped
processes of the filmy ferns.
(c) The peridium or volva of certain fungi. Called also
{involucrum}.
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Involucrum \In`vo*lu"crum\, n.; pl. L. {Involucra}, E.
{Involucrums}. [L. See {Involucre}.]
1. (Bot.) See {Involucre}.
2. (Zo["o]l.) A sheath which surrounds the base of the lasso
cells in the Siphonophora.
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