. Bulletin of the Department of Agriculture. Agriculture; Agriculture. Bui. 1038, U. S. Dept. of Agriculture. PLATE FRESH Living Cells of pecan Leaves. Camera-lucida drawings of freehand vertical sections, mounted in water. All at the same mag- nification (X about 1,200) and oriented the same as in the leaf. A.—Healthj^ paUsade cell, showing well-deflued nucleus and plump livid-green chloroplasts. B.—A disorganization stage of a palisade ceU in a leaf affected with rosette; chloroplasts disintegrated and nuclear outline vague. C.—Healthy cell of the spongy parenchyma. D.—Slightly di
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. Bui. 1038, U. S. Dept. of Agriculture. PLATE FRESH Living Cells of pecan Leaves. Camera-lucida drawings of freehand vertical sections, mounted in water. All at the same mag- nification (X about 1,200) and oriented the same as in the leaf. A.—Healthj^ paUsade cell, showing well-deflued nucleus and plump livid-green chloroplasts. B.—A disorganization stage of a palisade ceU in a leaf affected with rosette; chloroplasts disintegrated and nuclear outline vague. C.—Healthy cell of the spongy parenchyma. D.—Slightly diseased cell of the spongy parenchyma in which the chloroplasts have lost a part of their green color. E.—Spongy paren- chyma cell at the margin of a yellow area. The protoplasmic structures on the side toward the spot (right) are disorganized and the nucleus is fragmenting. Chloroplasts next to the green periphery of the spot Ueft) are stiU green and unfragmented, though a part of them are smaller than normal. F and G.—Spongy cells at further stages in disorganization. H.—Spongy cell showing entire disorganization of contents. I.—Tannin degeneration products gathering into flocules at a later stage of the disease in a spongy cell. J.—Spongy cell at the red-brown stage with more or less homogeneous reddish brown contents plasmolized. K.—Spongy cell at the margin of a yellow area (right) showing chloroplasts red-brown, but unfragmented on the side toward the spot. This form of injury is rather uncommon. Drawings by the Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Dept. of Agriculture. [Washington, D. C. ?] : The Dept. : Supt. of Docs. , G. P. O.
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