298 



PLANT LIFE. 



become filled with reserve food, constituting then the so-called 

 endosperm; around this is the remnant of the sporangium, 

 when more than a mere membrane, likewise stored with food, 

 and <alled the perisperm ; while over all is the hardened in- 

 tegument or iesta, often of unlike layers, /, if, in. 



404. Fruit. — In the conifers the sporophylls hearing the 

 ovules and the axis from which they arise also grow. As tin- 

 ovule is becoming the seed each sporophyll enlarges, but 

 especially the placental out- 

 growth (set' • 334), and the 

 whole number, together with 

 the enlarged axis, form the 

 cone (fig. 341, 358). Some- 

 times (as in the junipers) the 

 sporophylls become fleshy and 

 adherent, forming a berry-like 

 body. 



34'- 



.;(-•• 



Fig. 341.— A mature cone ol .1 pine (Pinus sylvestris), the upper quarter cut away. 

 sq, s</\ the placenta] si ales ; g; seeds ; <•«/, embryo in a seed, lust below the pla- 

 cental scale which bears the lower seed e, may be seen part of the carpellary scale 

 in section. Magnified about 2 diam. From liessey. 



Fig 342. — A placental scale of pine {P. sylvestris) seen from above; showing two 

 winged seeds in place. .1/, micropyle ; «'//. limit oi si ed ; the parts beyond are Rat 

 wings, formed by the splitting off of a layer ol tissue from the surface of the scale. 

 Magnified about ; diam. Vtoxa Bessey. 



