Bulletins on forest pathology - from Bulletin U.S.D.A., Washington, D.C., 1913-1925 (1913) (19884493383)

Title: (Bulletins on forest pathology : from Bulletin U.S.D.A., Washington, D.C., 1913-1925)
Identifier: bulletinsonfores00unit (find matches)
Year: 1913 (1910s)
Authors: United States. Dept. of Agriculture
Subjects: Trees; Plant diseases
Publisher: (Washington : U. S. Dept. of Agriculture)
Contributing Library: Robarts - University of Toronto
Digitizing Sponsor: University of Toronto



Text Appearing Before Image:
Bui. 1131, U. S. Dept. of Agriculture. Plate IV.
Text Appearing After Image:
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.)