38o 



GYMNOSPERMS 



that there is a suggestion of the origin of endosperm in the angio- 

 sperm sense (fig. 362). Land^^' did not show a definite fusion of the 

 second male nucleus with the ventral canal nucleus. 





A O.J ;-;^ :, 



^>*^^:<!^-'v'n^C| 



A B 



Fig. 362. — Ephedra Ir if urea: proembryos: A, group of spindles from second male 

 cell and, below them, small cells which have come from jacket cells, or from the division 

 of the non-functioning procmbryonal cells, or both; farther down, two functional pro- 

 embryonal cells; B, three of five proembryonal cells, also jacket nuclei in egg cyto- 

 plasm, and free masses of cytoplasm; X500. — .\fter Land. J" 



Miss Berridge and Miss Sandav** found a similar situation in 

 Ephedra distachya, but thought the nuclei at the top of the egg fused 

 in pairs and formed functional embryonal cells. Nuclei in pairs are 



