FIG. 299. Carpellate cone, carpels, and seed of the Scotch pine 



(Pinus sylvestris) 



A, young growth with carpellate canes, about three weeks after the opening of 

 the terminal bud: n, young piile needles. B, inner and side view of a cone 

 scale at the time of pollination as shown in A: b, bract; o, ovules. C, inner 

 and side view of scales from a two-year-old cone as shown in D : b, bract; 

 o, fertilized ovules now rapidly maturing into winged seeds; w, the developing 

 wings. D, a two-year-old cone. E, a mature winged seed. F, section of 

 mature seed : t, hard seed coat, or testa, developed from the integument of the 

 ovule (see Fig. 3^0, A, i); n, a membranous seed coat which is the remains of 

 the nucellus (see Fig. 300, A, n) ; en, endosperm or tissue of the female gameto- 

 phyte (see Fig. 300, A) ; em, embryo with group of cotyledons c and the 

 suspensor s; m, micropylar end of seed 



370 



