Calyptrate perianth (operculum)

Flora of Australia Glossary — Vascular Plants

Compiled by A. McCusker

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Calyptrate perianth (operculum)

calyptra: in mosses, a cap-like structure covering or partly covering the capsule and derived from the neck of the archegonium; in a flower (= operculum), a cap formed by fusion or cohesion of perianth parts and covering the stamens and carpels in the bud.

operculum: in a flower, a cap formed by fusion or cohesion of perianth parts and covering the stamens and carpels in the bud, becoming detached at maturity by abscission; especially in Eucalyptus, see calyptra.