332 



GYMXOSPERMS 



cell has roundcfl olT and has enlarged, but its nucleus is still in the 

 resting condition. 



The arrival of the pollen tube while the female gametophyte is in a 

 comparatively early stage of development is more frequently found 

 where the male gametes are highly organized cells. 



Fig. 325. — Torreya taxifolia: A, two-celled microspore on degenerating cells at tip 

 of nuccUus; pc, pollen chamber; B, enlarged end of pollen tube in contact with the fe- 

 male gametophyte which is still in the free nuclear stage (June 21, 1904); X460. — After 

 ("ouLTi'.R and Land.'" 



In forms like Pinus, where the sperms are nearly or quite naked 

 nuclei, the cellular condition is reached by the female gametophyte, 



