e, 



Fig. 339. — Pinus banksiana: A, young embryo with suspensor {s), apical cell (a), 

 first embryonal tube (ei), and second embryonal tube (ca); B and C apical stages, show- 

 ing apical cell and some segments; D, later stage with growth by group of cells; E, 

 embryo showing part of suspensor {s), with first embryonal tube (ci), below it, two long 

 embryonal tubes, and still lower more embryonal tubes [t) ; F, four young embryos from 

 rosette cells; A-D, X300; E, F, X80. — After Buchholz.^* 



