Scanning Electron Microscopy of Mature Douglas-Fir Earlywood Intertracheid Pitting

Authors

  • Frederick L. Brown
  • Harry M. Baker

Abstract

Scanning electron micrographs of mature earlywood intertracheid pitting of Douglas-fir, Pseudotsuga menzeisii (Mirb.) Franco, demonstrate the advantages and limitations of the scanning electron microscope. The micrographs portray the variation encountered in pit membrane structure. The micrographs are interpreted to support Harada and Côté's (1967) proposed organization of the pit border and, at least in some instances, the aggregation of primary wall fibrils to form large margo strands.

References

Harada, H., and W. A. Côté, Jr. 1967. Cell wall organization in the pit border region of softwood tracheids. Holzforschung, 21(3): 81-85.nMurmanis, L., and I. B. Sachs. 1969. Structure of pit border in Pinus Strobus L. Wood and Fiber, 1: 7-17.nThomas, R. J. 1968. The development and ultra-structure of the bordered pit membrane in the southern yellow pines. Holzforschung, 22(2): 38-44.nThomas, R. J. 1969. The ultrastructure of southern pine bordered pit membranes as revealed by specialized drying techniques. Wood and Fiber, 1: 110-123.nWardrop, A. B., and G. W. Davies. 1961. Morphological factors relating to the penetration of liquids into wood. Holzforschung, 15(5): 129-141.nCampbell, W. B. 1933. The cellulose-water relationship in papermaking. Canadian Dept. Interior, Forest Service Bull. No. 84.nStamm, A. J. 1964. Wood and cellulose science. Ronald Press Co., New York. p. 215-216, 260-263.nStamm, A. J. 1966. Maximum pore diameters of film materials. Forest Prod. J. 16(12): 59-63.nStamm, A. J., S. W. Clary, and W. J. Elliott. 1968. Effective radii of lumen and pit pores in softwoods. Wood Science 1(2): 93-101.nZuidemn, H. H., and G. W. Waters. 1941. Correction factor for surface and interfacial tension by ring method. Ind. Eng. Chem., Anal. Ed. 13: 312.nBiblis, E. J. 1969. Tensile properties of loblolly pine growth zones. Wood and Fiber1(1): 18-28.n

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Published

2007-06-19

Issue

Number 1 / Spring 1970

Section

Research Contributions

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