The sporophyte grows up from the archegonium. The perichaetium structure is composed by an archegonium, paraphyses and perichaetial leaves. In land plants, the zygote is formed within a chamber called the archegonium. In Bryophyte land plants, fertilisation takes place within the archegonium. The horn-shaped sporophyte grows from an archegonium embedded deep in the gametophyte. The gametophytes produce male (antheridium), and female (archegonium) gametes. On a female bryophyte shoot, the reproductive structure is called the archegonium (plural&colon; archegonia). Since the sperm must swim to the archegonium, fertilisation cannot occur without water. The male gametophyte is named the antheridium and the female the archegonium. Rain may splash sperm into the archegonium, or sperm may swim to the archegonium. As the zygote divides and grows, it does so inside the archegonium. Gymnosperms have their archegonium formed after pollination inside female conifer cones (megastrobili). An archegonium is a multicellular reproductive organ that produces female gametes. The archegonium has a long neck canal or venter and a swollen base.