Archegonium of Bracken
An illustration of the archegonium of bracken. An archegonium (pl: archegonia), is a multicellular structure or organ of the gametophyte phase of certain plants producing and containing the ovum or female gamete. The archegonium has a long neck and a swollen base.
Benson John Lossing, ed. The New Popular Educator (London, England: Cassell & Company Limited, 1891)