Noun
The pistillidium or female organ in the higher cryptogamic plants, corresponding to the pistil in flowering plants.
Source: Webster's dictionaryIn these plants, the embryo begins its existence attached to the inside of the archegonium on a parental gametophyte from which the egg cell was generated. Source: Internet
The inner wall of the archegonium lies in close contact with the "foot" of the developing embryo; this "foot" consists of a bulbous mass of cells at the base of the embryo which may receive nutrition from its parent gametophyte. Source: Internet