Abstract
Microscopical examination of the xylem of straight Eucalyptus regnans trees of high growth stress revealed the presence of radial dislocations in the secondary wall of many of the fibres. These features were characterized by a localized disruption in the microfibrillar orientation of the cellulose and were evident in both unlignified and lignified cell walls. Dislocations were not detected in trees having low peripheral growth stress. The origin of these features was suggested to lie in the expansion of the cell wall during the relaxation of longitudinal growth stresses following removal of the sample from the tree. A similar origin of the typically convoluted form of the gelatinous layer of tension wood fibres is discussed.
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