secondarygrowth213-page7

secondarygrowth213-page7 - often distinguish wood patterns...

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Secondary Growth in Stems: Wood, Bark and Surface Features - 7 Wood (Xylem) Features When wood is observed, many different patterns are possible depending on the orientation (or plane) of the wood when the wood is cut, as well as differential pattern of growth rings found in most wood. Since we know that cells have three dimensions, the way in which tissue is cut and observed will give a different appearance to the cells. These patterns are referred to as the "grain" of the wood. The orientation of the rays is helpful in determining grain patterns. Although we can
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Unformatted text preview: often distinguish wood patterns macroscopically, looking at the cells microscopically is more revealing. Inspecting wood for grain pattern is easier at first in Conifers than in Angiosperms because the tracheids in conifer wood are more uniform. Xylem patterns and wood grain Wood is commonly cut in one of three ways: transverse, tangential or radial Transverse or cross section A transverse section will cut wood so that we see the "ends", or cross sections (short dimension) of vessels, tracheids and fibers and the tops (long dimension) of rays....
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This note was uploaded on 01/08/2012 for the course BIO 213 taught by Professor Makina during the Fall '09 term at SUNY Stony Brook.

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