286 



MORPHOLOGY OF GYMNOSPERMS 



? 









■ _■';/■*, 









332 



336 



337 



Figs. 332-337. — Fertilization in Pinus: fig. 332, P. silvestris, the sperm nucleus 

 entering the egg nucleus, June 19; X13S; after Blackman (46) ; fig. 333, P. Lorioo, 

 the chromatin of the sperm and egg nuclei in the spirem stage within the limits of the 

 egg nucleus; XSo°i after Chambeexain (51); figs. 334-337, P. 5Zro6ai; fig. 334, a 

 somewhat later stage than that shown in fig. 333; fig. 335, the spirems of the egg and 

 sperm nuclei after segmentation; fig. 336, the two spirems after segmentation; the 

 two halves of the spindle seem to indicate the paternal and maternal parts of the 

 mitotic figure; fig. 337, longitudinal section, showing the orientation of chromosomes 

 it the nuclear plate, the egg and sperm chromosomes no longer distinguishable; 

 X31S; after Miss Ferguson (87). 



