This arose out of the definition of central cell (see https://sourceforge.net/tracker/index.php?func=detail&aid=3080937&group_id=76834&atid=835555\).
archegonial initial cell (PO:0025510): An initial cell that is part of an archegonium megagametophyte (PO:0025282) and divides to give rise to an archegonium (PO:0025126).
Added archegonium central cell develops from archegonium initial cell. Didn't add archegonium develops from archegonium initial cell, because I think that is only true in gymnosperms.
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