Wood samples from Populus deltoides Marsh. were used to investigate the relationship of gelatinous fibers to the size and number of other wood elements. An increase in the amount of gelatinous fibers was related to a decrease in diameter and an increase in wall thickness of non‐gelatinous fibers. The relative sizes of rays, vessels, and fibers were inter‐related, but all of these wood elements decreased in size with an increase in the amount of gelatinous fibers. Apparently environmental conditions controlling the differentiation of gelatinous fibers also influence the development of associated wood elements. Thus, the adverse physical properties of reaction wood must be attributed to all of these structural differences in the wood and not merely to the presence of large numbers of gelatinous fibers.
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