1. A sporangium that produces megaspores, typically found in heterosporous plants such as ferns and seed plants.
Usage: botanical term; technical

Examples

• The megasporangium in ferns contains the larger megaspores that develop into female gametophytes.
• In seed plants, the megasporangium is located within the nucellus of the ovule.
• The structure of the megasporangium differs significantly from that of the microsporangium.
• Botanists examine the megasporangium to understand plant reproduction in heterosporous species.
• The megasporangium releases megaspores that eventually produce the egg-bearing archegonia.