What is another word for calyptra?
Pronunciation: [kˈalɪptɹə] (IPA) 
Calyptra is a term commonly used in botany that refers to the cap-like structure that covers the apex of a sporangium. Synonyms for calyptra include operculum, lid, cap, covering, and hood. The operculum is a synonym for calyptra that refers specifically to the lid-like structure covering a capsule in certain plants. The synonym "cap" is used in a wider sense to indicate a variety of coverings, such as a mushroom cap or the cap-like structure encasing a flower bud. "Covering" is a synonym that denotes any membrane or structure enclosing a plant part, while "hood" specifically refers to a calyptra shaped like a hood.
