Foliar Ray in the Wood of the Dicotyledons, 66 1 



Fig. ii. Castanopsis tribuloides. Transverse section of the mature wood of the stem, showing 

 the remains of a once strongly developed aggregate ray. x 60. 



Fig. 12. Castanopsis tribuloides. Transverse section of the mature root, showing evidence 

 of the reduction of aggregate rays in the root, x 60. 



PLATE LXIII, 



Fig. 13. Castanopsis tribuloides. Transverse section ot a mature twig, showing the strongly 

 depressed segments produced by well-developed approximated foliar rays, x 10. 



Fig. 14. Castanopsis indica. Transverse section of a mature stem, showing the persistence of 

 five well-developed depressed segments, x 10. 



Fig. J 5- Quercus velutina. Transverse section of a mature twig, showing five small depressed 

 segments which are produced by five pairs of closely approximated lateral leaf-trace rays, x 20. 



Fig. 1 6. Castanopsis hystrix. Transverse section near the node of the mature twig, showing 

 the persistence of two strongly depressed segments (y} which are related to the lateral leaf-traces 

 of this node. Indications of the three other depressed segments (*) are more or less feebly 

 developed, x 10. 



Fig. 17. Castanea pumila. Transverse section of a vigorous mature twig, showing the 

 retention of five depressed segments after the disappearance of the foliar rays, x 10. 



