174 BOTANICAL GAZETTE [march 



Fig. 38. By successive divisions of primary neck cell and growth of central 



with peculiar thread 



formed 



sinde nucleolus. 



prophase; spirem continuous; a 



Fig. 40. Early metaphase; chromosomes, daughter halves in pairs, have 

 shortened. 



'Wth continuinsT durine: mi 



daught 



figure shown in fig. 41 under higher magnification; 

 ^somes almost similar in amount: thread structures 



in cytoplasm. 



Fig.. 42. Telophase; two daughter nuclei unequal in size; ventral nucleus 

 considerably larger than nucleus of neck canal cell. 

 Fig. 43. Prophase of mitosis in a neck canal cell. 

 Fig. 44, Anaphase of same. 



Fig. 45. Telophase; a cell plate laid down between two neck canal cell nuclei; 

 cytoplasm with vacuoles o\ 



various sizes. 

 :he2:omum af 



ventral cell in metaphase. 



already 



body 



-jig. 46 under higher magni 



Fig. 47. Section of archegonium; ventral cell nucleus in telophase; 



twi 



canal 



Fig. 47a. Two daughter nuclei sho^ra in fig, 47 under higher magoifi 

 size and shape quite different; both contain a number of nucleoli; dome-i 

 cell plate laid down separating egg and ventral canal cell. 



and 



:onium 



after completion of egg, ventral canal 



•TIG. 49. Section of archegonium with open neck; canal cells becoming muci- 

 laginous, with disorganizing nuclei; egg nucleus irregular; single nucleolus 

 present, due to union of several nucleoli seen when nucleus was organized. 



PLATE VIII 



Fa^tilization 



Fig. 50. Entrance of a number of sperms; many of them have akeady reached 

 the egg. 



Fig. 51. Union of sperm and egg; sperm partly within egg nucleus; cytoplasm 

 of egg enveloping nucleus very shallow toward neck . 



Figs. 52a, b. Two sections of same egg nucleus containing sperm, which 

 has not changed; dear region surrounding sperm; upper side of figures toward 



Figs. 53a, b. Two sections of same egg nucleus containing sperm in later 

 stage than that shown in previous figures; disintegration besun: compact body 



