Wiktionary
leptosporangiate
a. (context botany English) That has sporangium that were each formed from a single epidermal cell; of, pertaining to, or characteristic of leptosporangiate ferns.
WordNet
leptosporangiate
adj. (of ferns) having each sporangium formed from a single epidermal cell; "leptosporangiate ferns" [ant: eusporangiate]