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Calyptra (from καλύπτρα (kalúptra) "veil") is a scientific term used in botany. It describes a feature in plant morphology.
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Bryophytes
In bryophytes, the calyptra (plural calyptrae) is an enlarged archegonial venter that protects the capsule containing the embryonic sporophyte. The calyptra is usually lost before the spores are released from the capsule. The shape of the calyptra can be used for identification purposes.
Flowering plants
In flowering plants, the calyptra is a covering tissue for stamens and carpels. The name is also used for the capping tissue of roots, the root cap.
References
Calyptra Wikipedia(Text) CC BY-SA