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. 7>, 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. 300, A, i) ; n, a membranous seed coat which is the remains of 

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

 phyte (see Fig. 300, A) ; era, e.nbryo with group of cotyledons c and the 

 suspensor s ; m, micropylar end of seed 



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