Bui. 1038, U. S. Dept. of Agriculture. 
Plate V. 
Freehand Vertical Sections of Pecan Leaves, Frotscher 
Variety. 
Semidiagrammatic cainera-lucida drawings of diseased and healthy leaves, showing tissue 
changes due to rosette. Collected on August 25, 1919, at Thomasville, Ca. All of same mag- 
nification. The small side diagrams show the relative size and shape of the leaves and the 
locations of the sections. A. — Section through the center of a thin, yellow area, showing 
close packing of the cells and lack of differentiation. B. — Section at the margin of the 
yellow spot in the green portion of a leaflet, showing the close packing of the cells and 
the partial decrease in the long axis and increase in the short axis of palisade cells. C. — Sec- 
tion through a healthy leaflet, showing palisade and spongy tissue well developed and the 
looser arrangement of the spongy cells, the narrower openings being intercellular spaces. 
D.— Section of a mottled, linear leaflet, showing the close packing of the cells and only partial 
differentiation of the palisade cells. Drawings by the writer. 
