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In botany, an operculum (pl.: opercula) or calyptra (from Ancient Greek καλύπτρα (kalúptra) 'veil') is a cap-like structure in some flowering plants, mosses, and fungi. It is a covering, hood or lid, describing a feature in plant morphology.
Flowering plants, Bryophytes & Fungi
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operculum calyptra flowering plants fungi covering lid capsule also mosses usually shed outer opercula cap-like structure bryophytes sepals pollen botany
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