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calyptra of tortula moss Tortula muralis

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.

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