314 BOTANICAL GAZETTE [October 



ie meta 

 almost 



telophase is shown in fig. 51. The chromosomes seem to remain 

 distinct here (figs. 51 and 52) and could often be counted after the 

 nuclear membrane was formed. Fig. 53 shows t 

 the homotypic division; the two spindles being 

 angles, one nucleus is cut exactly at the plate and the other shows 

 almost all of the spindle. The formation of the tetrad is shown in 

 fig. 54. Different views of the microspores soon after their forma- 

 tion are shown in figs. 55 and 56. The nucleus divides at once to 

 form the tube and generative nuclei (figs. 56-59). The wall appar- 



ently disappears early, 



/tes without a wall 

 same anthers. The 



stages shown in figs. 55-59 come from the same anthers, all the 



same 



Fertilization. 



micro 



which is usually open (figs. 30, 42, 43), curves around the tip of the 



seems 



notch (fig. 60). In this sac the other synergid is quite dark, and 



Fertilization has already 

 nuclei. In fig:. 61 the 



mass 



erm 



same dark appearance of one synergid is found, and again the other 

 synergid is unchanged. Fusion of the sex nuclei has already taken 

 place ; both the egg and the primary endosperm nucleus show much 

 more chromatin than thev do in the mature sac (fig. 4.0- Several 



same 



stage. Only one more 

 will be shown (fig. 62). In this the bending of the tube around the 

 upper part of the synergid is not so clearly shown, as the section was 

 not so fortunate in position as that in fig. 6o, yet the tortuous course 

 is quite evident. But especially clear is the 



em 



into one synergid. 



sist of a very 

 distinguished 



except one nucleolus, which is quite clear because of its bright red 

 color in the dark purplish mass. It is probably the nucleolus of the 

 synergid nucleus. The other synergid is in the next section and is 

 quite normal in every respect. 



VRD 



the pollen tube passing into one synergid and discharging its con- 

 tents there. Juel (14) has described a similar passing of the 



