THE WALLFLOWER 



117 



of two coats, the integuments, which arise from the 

 lower part of the micellus and enclose it, leaving 

 only a narrow passage, the micropyle, leading down to 

 the free end of the nucellus. The funicle contains 

 a vascular bundle, branching off from the bundle- 

 system of the ovary. The bundle terminates at the 



FIG. 43. Longitudinal section through an ovule and part 

 of the ovary wall of Wallflower, ov, ovary wall ; h, a 

 liair ; /, funicle of ovule ; ch, chalaza ; n, micellus (which 

 is only persistent at the base) ; w l5 inner integument ; 

 in%, outer integument ; m, micropyle ; e, e, embryo-sac ; 

 p.t y pollen-tube, entering micropyle. Magnified about 

 50. (R. S.) 



base of the nucellus (see Fig. 43, ch). The base of 

 the ovule, where the integuments spring from the 

 nucellus, is called the chalaza. All these parts, except 

 the vascular bundle, consist of delicate parenchyma. 



In the nucellus is a long cell, the embryo-sac (see 

 Fig. 43, e), which is much larger than its neighbours, 



