﻿7 2 



VEGETATIVE FEATURES. 



In the next lower section, 243, there is little change, but in S. 244 the pedun- 

 cular bundle is seen to be in process of division, which is still more pronounced in 

 S. 245. In S. 246, figure 37, the branch (b) is no longer recognizable as connected 

 with L ; while a does not appear, because of a considerable patch of clear, 

 structureless silica, which is not indicated in the drawing. The further course of 

 branch b is found upon inspection of the remaining sections to lie side by side, 

 if not in actual union, with another leaf trace marked L.B. Both apparently 

 originate as a single bundle to be seen near its origin on the woody cylinder in 

 section 261. 



Pot*? m f -ft &<=>d 



oRPa ih8p\ s3t« 



8£trH 



A. Outer region of phloem of same bundle shown in figures B. Xylem. cambial line (c-c), and most of phloem of same 



39 B and C. (Walls of thicker-walled cells shown a shade too bundle shown in preceding figure. 



Fig. 39 A-B.-Cycadeoidea Wielandi. S. 261. T. 393 X 100. 

 Transverse section through peduncle trace. Cut a short distance above the origin on the woody cylinder of the trunk from 

 a portion traversing the middle region of the cortical parenchyma. Placed tandem, these and figure 39 C traverse the 

 entire xylem and phloem regions of the peduncle. 



Reviewing, it is seen that the peduncle trace (/) is not shown to be in actual 

 union with its subtending leaf trace, although it forms with it the singularly charac- 

 teristic axillary pattern, noted not only in sections 243-245, but in various others. 

 On the contrary, the peduncular bundle in the instance before us certainly divides 

 into two branches, of which that denoted lb passes to the right and finally becomes 

 separable with difficulty from and then confluent with a lateral leaf trace. 



Let attention now be fixed upon the second peduncle trace (II ) which appears 

 in these sections and is cut throughout its lower course by longitudinal section 249. 

 In section 216 peduncle trace // is cut very obliquely and almost exactly at the point 

 of its emergence from the cortex, or at insertion of peduncle and leaf bases on the 

 cortex as forming the base of the armor. Passing by the successively lower sections, 



