calyptra

1. The protective cap or hood covering the spore case of a moss or related plant.
2. A similar hoodlike, lidlike, or caplike structure, such as a root cap.

[Medieval Latin, from Greek kaluptra, veil, from kaluptein, to cover.]

The noun has one meaning:

Meaning #1: the hood or cap covering the calyx of certain plants: e.g., the California poppy

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calyptra of tortula moss Tortula muralis

For the genus of moth, see Calyptra (genus).

In bryophytes, the calyptra (plural calyptrae) is an enlarged archegonia 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.^[1]

In flowering plants, the calyptra is a covering tissue for stamens and carpels. The name is also used for the capping tissue of roots.

References

1. ^ Malcolm; Malcolm, Bill; Nancy (2006), Mosses and other Bryophytes, an Illustrated Glossary, Micro-Optics Press, p. 65, ISBN 0958222479 

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