134 



BOTANICAL GAZETTE 



[august 



■T 



m 



Fig. T2. — An ovulate cone; some of the 

 sporophylls have been removed, showing the 



Archegonia may be formed 

 at the micropylar end of the 

 gametophyte, or on the lobes 

 produced on the sides or 

 loAver end, or on the unlobed 

 surface, or in rare cases within 

 the tissues in^ such position as 

 to open to the median cleft 



ifig^' 3^^ 48. 49^ 50) > They 

 are more abundant at the 



micropylar end than else- 

 where, and in many cases 

 they are formed in no other 

 region (fig, 48) . The number 

 of archegonia is large; one 

 cross-section made a little 

 back of the end of the game- 

 tophyte showed 169 distinct 



Doubtless in 

 many cases the number 

 exceeds 200 m the entire 

 gametophyte and may even 

 be double that number (fig. 

 4p). There is apparently 

 little difference in the age of 

 archegonia at the micropylar 

 end and on the lateral lobes. 



material 



archegonia. 



The 



age of the 



did not permit a study of the 

 development of the arche- 

 gonium. Two neck cells are 

 formed, but these do not pro- 

 trude as noted in Zamia by 

 Coulter and Chamberlain 



(10), and in Dioon by 



Chamberlain (4) ; they may 

 extend slightly beyond the 



central axis and the attachment of the ovules- SUrface of the gametOph\^e 



1 



