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

 (Pinus sylvestris) 



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

 the terminal bud : n, young pine 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 mature cone as shown in D : b, bract ; o, ferti- 

 lized ovules now rapidly maturing into winged seeds ; w, the developing wings. 

 D, a mature 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. 300, 

 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 gametophyte (see Fig. 300, 

 A) ; em, embryo with group of cotyledons c and the suspensor s ; m, micropylar 

 end of seed 



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