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Australian Biological Resources Study

Flora of Australia
GLOSSARY

Compiled by A.McCusker


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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.
Calyptrate Perianth (operculum)
Commonwealth of Australia