perigonium
/ˌpɛrɪˈɡoʊniəm/
noun
- The envelope of modified leaves surrounding the reproductive organs in mosses and liverworts.
- The perigonium protects the developing sex organs of the moss.
- Under the microscope, the perigonium appeared as a cluster of tiny leaves.
- Each perigonium contains the male reproductive structures in some bryophytes.