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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]