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A Tree and Its Trunk
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On close inspection of a tree trunk one can see individual xylem cells. They are arranged longitudinally. The shape of xylem cells is what gives wood its unique characteristics. Pine trees and other conifers have long, narrow xylem cells called tracheids. This shape provides a surface that gives strength to paper products. This is one reason why pine fiber is so valuable to the forest products industry.
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| Oak trees and other angiosperm species have xylem cells with variable shapes. Oaks are unique because they transport water through vessel elements that are so wide they can be seen with the naked eye. |
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