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female gametophytes

Listing 1 - 10 from 15 for female gametophytes

Division Lycophyta
... (heterosporous), microspores and megaspores, which give rise to male and female gametophytes and sperm cells with two flagella. The development of the gametophytes is described to be "endosporic", a character peculiar to the ...
home.manhattan.edu

Fern Allies
... separate male and female gametophytes;- Each megasporophyll bears a megasporangium which by meoisis produces 4 megaspores which in turn form female gametophytes and female gametes. Each microsporophyll bears a microsporangium which by meoisis produces many microspores which in turn form male gametophytes and male gametes. In Selaginella, gametophytes ...
scitec.uwichill.edu.bb

Azolla and Anaebaena Symbiosis
... actual sex organs (the female archegonium and male antheridium). Azolla has microscopic male and female gametophytes that develop inside the male and female spores. The female gametophyte protrudes from the ... glochidia on the male spore clusters presumably cause them to cling to the female megaspores, thus facilitating fertilization. According to some references, the universal occurrence of ...
waynesword.palomar.edu

Small_vascular_plants
... endosporal. 1. Microspores from microsporangia produce male gametophytes 2. Megaspores from megasporangia produce female gametophytes. Found in some Lycophyta, a few Pterophyta/Filicophyta, and all seed plants. Equisetum is interesting in that it exhibits homospory, but physiologically is heterosporous, with dioecious gametophytes. C. Gametophytes ...
www.cs.cuc.edu

Gymnosperms
... gametophyte begins to germinate from the pollen grain, i.e. pollen tube. Thus both male & female gametophytes develop within the ovule, and are nourished by nucellus. E. Male gametophyte The pollen ... 2 sperm nuclei, and several vegetative nuclei. F. Fertilization After about one year, the male & female gametophytes are mature, and the pollen tube with sperm nuclei has reached the archegonia. At ...
www.cs.cuc.edu
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Rhynie IV
... free-swimming sperm cells needed water to reach the egg cells of the female gametophytes. The female gametophytes have axes which are somewhat flattened to slightly bowl-shaped. The ... gametophytes, the life cycle of Aglaophyton and Rhynia can be reconstructed in great detail. An overview of the currently known Rhynie Chert gametophytes is given in the table below: Sporophyte Gametophyte Female ...
www.uni-muenster.de

The Cycad Pages
... weakly ornamented, cymbiform, monosulcate, and bilaterally symmetrical. Male gametophytes are large, multiflagellate and motile. Female sporophylls are simple and entire (dissected in Cycadaceae). Seeds ... carpophylls multi-ovulate ovules ascending stipules absent leaflet vernation circinate Zamiaceae female sporophylls in cones leaflets with multiple branching veins germination radiospermic ...
plantnet.rbgsyd.nsw.gov.au

Bryophytes
... alternation of generations. Meiosis produces half male and half female spores, so that a gametophyte is either male or female. In Marchantia , for example, the archegonia and the ... dispersed Division - Anthocerotophyta (Hornworts) Hornworts have rounded, small, thallose-like gametophytes which are found in moist shaded soils. The gametophytes may be unisexual or bisexual, depending on the species. ...
scidiv.bcc.ctc.edu

The Evolution of Seeds
... plant, producing only one megaspore per megasporangium. The megaspore is not released until the female gametophyte has fully developed within it, complete with archegonium and egg. Imagine that the ... gametophyte phase of the life cycle drastically. Whereas before dispersal depended on spores taking gametophytes (and ultimately sporophytes) to new habitats, the seed is the new means of dispersal. ...
scitec.uwichill.edu.bb

t
... on the sporophyte which are shed and germinate to grow into gametophytes which produce male organs with motile sperm and female organs with non-motile egg cells. Fertilization follows and the egg ... same prothallus (monoecious), or in the case of heterosporus species, on separate male and female prothallia (dioecious). Gametophytes have an ecology of their own which may be quite different to that of ...
www.anbg.gov.au




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