The remnants of the megasporangium tissue (the nucellus) surround the megagametophyte. It is the tissue where the integuments and nucellus are joined. The ovule initially consists of a stalked, integumented "megasporangium" (also called the "nucellus"). The tube simply soaks up nutrients from the female nucellus and grows in two stages. It is fused to the nucellus (central portion of the ovule) only at the base. These then develop a nucellus in which a mother cell is formed. It attaches or suspends the yolk or nucellus within the larger structure. The haploid megaspore inside the nucellus gives rise to the female gametophyte, called the "megagametophyte". Instead, the nucellus produces a nutritive tissue termed "perisperm". After fertilization, the nucellus may develop into the "perisperm" that feeds the embryo.