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In bryophytes (especially mosses), the calyptra is a cap of gametophyte tissue that protects the sporangium. This cap is lost when the sporanium capsule is mature and ready to release the spores. In flowering plants, the calyptra is a covering tissue for stamens and carpels. The name is also used for the capping tissue of roots.
Calyptra is also the name of a genus of moths.
"Calyptra"