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Forestry 1959 32(2):124-125; doi:10.1093/forestry/32.2.124
© 1959 by Institute of Chartered Foresters
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A NEW METHOD OF MEASURING TRACHEID LENGTH

J. L. LADELL

At the Imperial Forestry Institute Oxford

The image of a tangential microscope section is projected on to a surface on which two parallel lines are drawn at a known distance apart and at right angles to the long axis of the tracheids. The number of cell tips occurring between the lines in a predetermined number of contiguous cells is counted. Values are then substituted in the following relationship:

Mean tracheid length=Number of cells × distance between lines/numbers of cell tips

The method is faster than the usual maceration technique, but its greatest advantage is the accuracy with which samples can be located.


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