perisporangium
/ˌpɛrɪspəˈran(d)ʒɪəm/Botany rare
noun
A structure surrounding a sporangium; especially the indusium of a fern.
Origin
Mid 19th century; earliest use found in John Stevens Henslow (1796–1861), botanist and Church of England clergyman. From scientific Latin perisporangium from peri- + sporangium.