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In general, an involucre is a covering. It may refer to:
- in flowering plants: an involucral bract, or a pair, whorl or other collection of such bracts, surrounding a flower or an inflorescence
- in some fungi: the involucrum, peridium or volva
- in the fern family Hymenophyllaceae: the cup-shaped indusium surrounding a cluster of sporangia
- in the Fagaceae: a term sometimes misused for the cupule surrounding developing nuts (e.g., the cap of an acorn)
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