Gymnosperms : The Conifers 



511 



Fig. 317. Shoot of Pitius densiflora, with one-, two-, and three-year carpellate cones and a 

 few of the staminate cones. 



surface (Fig. 321). The ovule consists of an outer integument 

 (sporangium wall), inclosing an oval body of tissue, the nucellus. 

 At the inner end there is an opening in the integument, the mi- 



