3*6 BOTANICAL GAZETTE [October 



the synergid just below the notch. This 

 as unfortunately all my material was t 



em 



every 



But the pollen tubes themselves were unusually clear; they could 



micro 



entered the synergid. Chodat (3) shows the sex nuclei in various 

 stages of fusion in his figs. 678-680. 



Embryo. — One and two-celled embryos showed nothing un- 

 usual. The endosperm nucleus usually divides first; only one ex- 

 ception to this was seen (fig. 65). Here there is a five-celled embryo 



in shape, which 



d somewhat amoeboid 

 One sac was seen with 



mbryo and two endosperm 



and the other near the antipodals, and one synergid still perfect. 

 Empty pollen tubes are often very persistent in Pamassia. It is 

 not uncommon to find a pollen tube that can be seen through the 

 greater part of the micropyle and with the curve at the entrance to 

 the sac where it passes around the beak of the synergid, but with 



more cells. 



em 



embry 



again divides in the same plane as the first division, while the lower 

 cell divides at right angles (fig. 64). Fig. 65 shows the five-celled 

 embryo. Not many embryos of this stage were seen, but this 

 seems to be the usual arrangement of cells. Fig. 66 gives the next 

 stage, where the upper cell had again divided in the longitudinal 

 direction. In fig. 67 the dermatogen is differentiated, and a layer 

 of endosperm about two cells in thickness extends entirely around 

 the sac next to the wall; in the center are a few free nuclei. Soon 

 the plerome and periblem are also differentiated, as can be seen from 

 the end of the embryo, in fig. 68. This entire embryo is outlined in 

 tig. 69 and the plerome is dotted in. The two cotyledons are 

 already formed, and the embryo now completely fills the upper two- 

 thirds of the sac, except for a layer of endosperm about two cells 

 thick around it. The lower third of the sac is filled with endosperm. 

 Chodat (3) in his fig. 756 shows embryos from the two-celled stage 

 to the differentiation of the dermatogen; his figures 756-775 are 

 similar to my figures 75 and 81. 



