perine
/ˈpɛrɪn/ /ˈpɛriːn/ /ˈpɛrʌɪn/Botany
noun
In early use: the outermost layer of the exine of a pollen grain (now disused ). Later: an outer layer surrounding the wall of the spore in ferns, mosses, and clubmosses; a perispore.
Origin
Late 19th century. From peri- + -ine, after German Perinium.