Bui. 1038, U. S. Dept. of Agriculture. 



PLATE IX. 



Horizontal Sections of Normal and Mottled Pecan Leaflets. 



A and B.— Horizontal sections through the paUsade tissue ilhisi rated in figures A and B of Plate Vlll. 

 showing the enlargement of the short diameter of the palisade cells in the mottled leaflet ( B). C 

 and D.— Horizontal sections through the spongv parenchyma illustraled in figures A and B of 

 Plate \ III, showing the enlargement of the cells and the reduction in size of intercellular spaces in 

 the green area surrounding a yellow spot in the mottled leaflet (D). All figures X 540. Photo- 

 micrographs by the writer. 



