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Meiosis is not needed because the cells are already haploid. The egg is produced within a similar structure called an archegonium. These now diploid spores are released, germinate and grow into healthy gametophytes. Within the gametophyte, sperm is produced within a structure called an antheridium. View a medium magnification image of the fern prothallium.

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The number and diversity of ferns diminishes with increasing latitude and decreasing moisture, though a few species are found in dry, cold regions. Homosporous pteridophyte species are not all highly inbred or evolutionarily stagnant Haufler, The egg is produced within a similar structure called an archegonium. It is called the prothallus or gametophyte.

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The sperm produced by mosses require _____ to reach an archegonium. diploid, meiosis, haploid. If a fern gametophyte is a hermaphrodite (that is, has both male and female gametangia on the same plant), then it belongs to a species that is _____ unique to angiosperms, term used to describe one sperm fusing with the egg, while the other. As heterosporous plants, the fern's antheridium produces free-swimming sperm and its archegonium produces eggs. The products of their unions are zygotes, and fertilization occurs when the sperm swim through an opening (operculum) from each antheridium along a thin film of water to the neck of each archegonium. The male structure, the antheridium, contains many flagellated sperm. The sperm are released from the antheridium and swim through a thin film of water to a nearby archegonium to fertilize the egg. Since the antheridium and archegonium are on the same prothallus the fern .

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