136 



STRUCTURAL BOTANY 



(see p. 38). This innermost layer belongs to the endo- 

 sperm, of which it is the only remnant. The outermost 

 mucilaginous layer is the epidermis of the outer in- 

 tegument ; the brown cells in between belong partly 

 to one integument and partly to the other. The 



FIG. 49. Seed of Wallflower in section passing between coty- 

 ledons, h, t, testa ; ra, micropyle ; /, funicle ; r, radicle 

 of embryo ; above this is the hypocotyl ; g.p, growing 

 point of stem ; c, one of the two cotyledons. Magnified 

 about 20. (R. S.) 



funicle remains as before, and its vascular bundle can 

 still be traced in the ripe seed. The micropyle is 

 closed while the seed is ripening, but it still has a 

 part to play, as we shall see presently. The ripe 

 fceec], then, consists essentially of the funicle, the testa 



