300 BOTANICAL GAZETTE [april 



Fig. 37 — The position of the first primary wall and the large polar cavity 

 is to be noted. 



Fig. 38. — The second antheridial cell dividing. 



Figs. 39-40. — Laterally placed derivatives of first and second antheridial 

 cells. 



Figs. 41-46. — The third primary division. 



Fig. 41. — A polar view. 



Fig. 46. — Large primary nucleus (tube nucleus): the third antheridial 

 cell just before mitosis; the second in normal condition except for compression; 

 the first disintegrated. 



Fig. 49. — Mitosis in the first antheridial cell (cf. fig. 28). 



Figs. 47, 48, 50, 51. — Division of the third antheridial cell to form a 

 spermatogenous and a sterile cell. 



Fig. 52. — Showing polar cells, the products of secondary divisions. 



Fjg- 53- — Shows disintegrating derivatives of the first antheridial cell; 

 a sterile cell; a spermatogenous cell and the primary nucleus (or tube nucleus). 



