. [Bulletins on forest pathology : from Bulletin , Washington, , 1913-1925]. Trees; Plant diseases. Bui. 1131, U. S. Dept. of Agriculture. Plate Frost Rings of Pinus densiflora, Abies grandis, and Tsuga hetero- PHYLLA. A .—Transverse section of stem of Pinus densiflora taken 10 centimeters below the 1921 whorl of branches, showing a slight frost ring formationin the 1921 growth. (X135.) B.—Transverse section of Abies grandis, showing a more pronounced frost-ring formation, with the character- istic lateral displacement of the medullary rays and their proliferation. (X135.) C—T
. [Bulletins on forest pathology : from Bulletin , Washington, , 1913-1925]. Trees; Plant diseases. Bui. 1131, U. S. Dept. of Agriculture. Plate Frost Rings of Pinus densiflora, Abies grandis, and Tsuga hetero- PHYLLA. A .—Transverse section of stem of Pinus densiflora taken 10 centimeters below the 1921 whorl of branches, showing a slight frost ring formationin the 1921 growth. (X135.) B.—Transverse section of Abies grandis, showing a more pronounced frost-ring formation, with the character- istic lateral displacement of the medullary rays and their proliferation. (X135.) C—Trans- verse section through a frost-ring formation in Tsuga heterophylla, showing the formation of a broad zone of parenchyma wood (X135.). 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 : U. S. Dept. of Agriculture]
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherwashi, bookyear1913
