FIBRO VASCULAR TISSUES: RAYS 



that the structure of the ray in the twig in C. Fraseri is different 

 from the adult condition, shown in Figs. 58 and 63, for in the 

 younger axis the ray is obviously penetrated by fibers, and these 

 are absent in the adult. The truth of this statement will become 

 still more apparent by reference to Fig. 68, which reproduces the 

 tangential aspect of the wood in a somewhat older branch of the 

 same species. The prominent mass of radial storage tissue in 

 the center is the 

 foliar ray. It is dis- 

 tinctly fibrous and 

 is consequently still 

 in the condition of 

 aggregation. As 

 the stem thickens 

 the fibers are grad- 

 ually transformed 

 into parenchyma- 

 tous elements more 

 and more like the 

 cells of the ray. 

 Thus it is that the 

 compound ray of 

 C. Fraseri comes 

 into being. It is 

 evident that its 

 early condition is 

 one of aggregation, 



and that this is followed by a gradual transformation into the 

 compound state by the fusion of the originally separate members 

 of the aggregation. 



The photographic representations lead likewise to conclusions 

 in harmony with the diagrammatic figures in the case of the diffuse 

 condition of the foliar ray. It will not be necessary to introduce 

 a total general and a partial more detailed view of the twig in this 

 instance, since the topographical relations are practically the same 

 as those shown in the case of C. Fraseri. Fig. 69 illustrates the 

 situation in the diffusion of the foliar ray as exemplified by 



FIG. 67. Portion of Fig. 66 still more highly magni- 

 fied to show organization of the foliar ray. Explanation 

 in the text. 



