The male gametangia are most commonly called antheridia. They produce sperm cells that they release for fertilization. Antheridia producing non-motile sperm (spermatia) are called spermatangia. Some antheridia do not release their sperm. For example, the oomycete antheridium is a syncytium with many sperm nuclei and fertilization occurs via fertilization tubes growing from the antheridium and making contact with the egg cells. Antheridia are common in the gametophytes in "lower" plants such as bryophytes, ferns, cycads and ginkgo. In "higher" plants such as conifers and flowering plants, they are replaced by pollen grains.
Isogamousedit
In isogamy, the gametes look alike and cannot be classified into "male" or "female." For example, in zygomycetes, two gametangia (single multinucleate cells at the end of hyphae) form good contact with each other and fuse into a zygosporangium. Inside the zygosporangium, the nuclei from each of the original two gametangia pair up.[clarification needed]
gametangium, this, article, does, cite, sources, please, help, improve, this, article, adding, citations, reliable, sources, unsourced, material, challenged, removed, find, sources, news, newspapers, books, scholar, jstor, december, 2009, learn, when, remove, . This article does not cite any sources Please help improve this article by adding citations to reliable sources Unsourced material may be challenged and removed Find sources Gametangium news newspapers books scholar JSTOR December 2009 Learn how and when to remove this template message A gametangium pl gametangia is an organ or cell in which gametes are produced that is found in many multicellular protists algae fungi and the gametophytes of plants In contrast to gametogenesis in animals a gametangium is a haploid structure and formation of gametes does not involve meiosis Light micrograph of a whole mount slide of gametangia of Equisetum Contents 1 Types of gametangia 1 1 Female 1 2 Male 1 3 Isogamous 2 See alsoTypes of gametangia editDepending on the type of gamete produced in a gametangium several types can be distinguished Female edit Main articles Archegonium and Oogonium Female gametangia are most commonly called archegonia They produce egg cells and are the sites for fertilization Archegonia are common in algae and primitive plants as well as gymnosperms In flowering plants they are replaced by the embryo sac inside the ovule Male edit Main article Antheridium The male gametangia are most commonly called antheridia They produce sperm cells that they release for fertilization Antheridia producing non motile sperm spermatia are called spermatangia Some antheridia do not release their sperm For example the oomycete antheridium is a syncytium with many sperm nuclei and fertilization occurs via fertilization tubes growing from the antheridium and making contact with the egg cells Antheridia are common in the gametophytes in lower plants such as bryophytes ferns cycads and ginkgo In higher plants such as conifers and flowering plants they are replaced by pollen grains Isogamous edit In isogamy the gametes look alike and cannot be classified into male or female For example in zygomycetes two gametangia single multinucleate cells at the end of hyphae form good contact with each other and fuse into a zygosporangium Inside the zygosporangium the nuclei from each of the original two gametangia pair up clarification needed See also editZoosporangium a gametangium that produces motile isogamous gametes called zoospores Retrieved from https en wikipedia org w index php title Gametangium amp oldid 1181122229, wikipedia, wiki, book, books, library,
