in·vo·lu·cre /ˈɪnvəˌlukɚ/
總苞;皮膜;外膜
In·vo·lu·cre n. 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.
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involucre
n : a highly conspicuous bract or bract pair or ring of bracts
at the base of an inflorescence
[also: involucra (pl)]