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calyptra
''Calyptra'' (from καλύπτρα (''kalúptra'') "veil") is a scientific term used in botany. It describes a feature in plant morphology. ==Bryophytes== In bryophytes, the calyptra (''plural'' calyptrae) is an enlarged archegonial venter that protects the capsule containing the embryonic sporophyte.〔Ralf Reski (1998): Development, genetics and molecular biology of mosses. In: Botanica Acta. 111, 1-15.〕 The calyptra is usually lost before the spores are released from the capsule. The shape of the calyptra can be used for identification purposes.
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