The eusporangiate sporangium has the sporangial wall developing from superficial cells and the sporogenous tissue develops from internal cells of the sporophyll. The sporangia are large and contain a large number of spores.
The leptosporangiate sporangium develops entirely from the periclinal division of a superficial cell. The number of spores produced is a multiple of 2 (between 16 and 512 in homosporous species).
