(botany) That has sporangia that were each formed from a single epidermal cell; of, pertaining to, or characteristic of leptosporangiate ferns.
1900, Robert Wilson Smith, Structure and Development of Sporangia and Sporophylls of Isoetes, page 330,...which being leptosporangiate cannot be closely related to Isoetes, the sporangia appear late in the history of the leaf.
1908, Frederick Orpen Bower, The Origin of a Land Flora, page 639,In fact, it seems that in the Primary rocks the distinctive Leptosporangiate annulus was at least rare, if it existed at all.
1922, John Merle Coulter, Sir Humphry Davy, M.S. Coulter, The Collected Works of Sir Humphry Davy: Discourses Delivered before the Royal Society: Elements of Agricultural Chemistry, Part 1, page 264,Most of his material, which includes a variety of leptosporangiate species, was obtained from greenhouses.
