The Bordered Pit Membrane in Differentiating Balsam Fir

R. A. Parham, W. M. Baird


Bordered pit membranes in the cambial zone of balsam fir [Abies balsamea (L.) Mill.] were studied via surface replica and transverse section. An initially solid membrane is gradually perforated at tracheid maturity to yield a peripherally permeable margo bounded by a denser annulus and centrally thickened torus. Large, radially directed microfibrils in the margo are present at an early stage of pit development and do not arise as a result of pit aspiration. Relevance of findings to recent literature and viewpoints is discussed.


<i>Abies balsamea</i>;wood structure;electron microscopy

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