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Operculum (botany)

Red operculum of Eucalyptus erythrocorys
Operculum and scar of Eucalyptus blakelyi
Calyptra of Tortula muralis
Calyptra on top of the brown spore capsule (sporophyte) of the moss Physcomitrella patens. The brownish archegonial venter is still visible.

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.


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