Abstract
Dimpled grain in lodgepole, jack, and ponderosa pines is caused by resin blisters present in the inner bark. In Sitka spruce the grain deviation is caused by groups of sclereids in the inner bark. Both blisters and sclereids apparently exert pressure on the cambium and cause depressions to form in the xylem. In jack and lodgepole pines, distribution of dimpled grain, as measured by the number of depressions on a split tangential wood surface, is relatively constant throughout the tree with some degree of tapering off towards the pith and towards the top of the tree.
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