They are found between clusters of archegonia and antheridia. Fertilized eggs become zygotes, which develop into sporophyte embryos inside the archegonia. Eggs develop in archegonia and sperm in antheridia. The close proximity of the antheridia and archegonia help facilitate fertilization. Gymnosperms produce multiple archegonia, which produce the female gamete. Haploid gametes are produced in antheridia (male) and archegonia (female) by mitosis. The exact arrangement of the antheridia and archegonia in monoicous plants varies. The sporophyte produces spore capsules (sporangia), which are connected by stalks (setae) to the archegonia. Haploid gametes are produced in antheridia and archegonia by mitosis. These contain archegonia, the organs which produce the ova. In gymnosperms, fertilization occurs within the archegonia produced by the female gametophyte. Plants are usually monoicous, and sexual reproduction is by antheridia and archegonia. Megagametophytes produce archegonia (lost in some groups such as flowering plants), which produce egg cells. Two or three archegonia containing an egg then develop inside the gametophyte. The biflagellate sperm must swim from the antheridia, or else be splashed to the archegonia.