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Eusporangiate Ferns, those in which the sporangium is a massive organ arising from several cells, whereas in leptosporangiate ferns it is a more delicate structure derived from a single superficial cell.

The bulk of living ferns are leptosporangiate, the eusporangiate class comprising only two living families, viz. the Marattiace� and Ophioglossace�, as well as many extinct types.