calyptra
/kəˈlɪptrə/
noun
- A hood-like covering or cap, especially the protective cap on a moss spore capsule.
- The calyptra falls off when the moss spores are ready to be released.
- Botany students examined the calyptra to understand how it protects the developing spores.
- Under a microscope, the calyptra looks like a tiny pointed hat on top of the capsule.