Bui. 1038, U. S. Dept. of Agriculture. 
PLATE XI 
Vertical Sections of Healthy and Diseased Pecan Leaflets, 
Frotscher Variety. 
Collected on August 2."> and 26, 1919, at Thomasville, Ga. All figures at the same magnification. 
X 540. A.— Healthy pecan leaflet collected at sundown, killed in Carnoy's fluid, and stained 
with iodin to show the presence of starch in the palisade and spongy cells. B. — Healthy 
pecan leaflet collected in the morning, killed in Carnoy's fluid, and stained with iodin to show 
the absence of starch. C and D.— Pecan leaflets aborted with rosette, collected and treated 
in the same way, respectively, as in the preceding two normal leaflets. Chloroplasts in both 
night (C) and morning (D) specimens were gorged with starch, and apparently no trans- 
location had taken place during the night. Note also the enlargement of the cells in the dis- 
eased material. Photomicrographs by the writer. 
