Further Notes on Floral Structures. 



?9 



were cemented together again in their natural place for the 

 completion of the oriented sections showing the structure of 

 the entire flower bud, as now to be described. 



Fig. 3. 



s7 j7-Ec 



3 7 1 6 .-lb 



3,715-IIa 



Fig. 3. Cycadeoidea Marshiana. 



The series of transverse sections cut from the bisporangiate flower bud 

 No. 2 of Yale trunk No. 3. The exact level of each is indicated by letter 

 (B, C, a, b, c), and by section number in the longitudinal view, figure 2 B. 



Observe that the upper figures are more enlarged than the lower ones. At 

 / are the fronds, and b b' shows the line where the bract ramentum rests in 

 that of a leaf base. — II and W mark the trial saw cuts spoken of in the text. 



Note that the lower section c (S. 717) traverses the level of disk dehiscence, 

 while in the two succeeding sections b and a the disk collar is continuous. 

 Between these two sections b and a the ovulate axis finally terminates, and 

 between a and C (No. 728) disk division into the fronds /,/ occurs. — Con- 

 tinue to figure 3 A. For exact size compare with figure 2jB. — Cf. continua- 

 tion fig. 3 A. 



