Dun Aengus. Dun DÃºn aengus is the most famous of several prehistoric forts on The Aran, islands Of. Co. Galway. ireland
The female gametophyteâspecifically termed a megagametophyte âis also called the embryo sac in angiosperms. The megagametophyte produces an egg cell (or several egg cells in some groups) for the purpose of fertilization.he ovary of the gynoecium produces one or more ovules and ultimately becomes the fruit wall. Ovules are attached to the placenta in the ovary through a stalk-like structure known as a funiculus (plural, funiculi). Different patterns of ovule attachment, or placentation, can be found among plant species, these include:
Formation of the male gametophyte in flowering plants takes place within specialized male reproductive organs called the stamens and consists of two distinct sequential phases, microsporogenesis and microgametogenesis (Fig. 1).he first of these microarray datasets covers four stages of male gametophyte development (uninucleate microspores, bicellular pollen, tricellular pollen, and mature pollen) from ecotype Landsberg erecta (Honys and Twell, 2004).