Abstract
The fusiform cambial cells of conifers undergo two types of anticlinal division, pseudotransverse division and division to produce small cells off the side. Pseudotransverse divisions are largely confined to the cambial initials, only a small percentage of such divisions occurring in the derived tissue mother cells. The incidence of pseudotransverse divisions outside the layer of initials tends to rise with the rate of growth. Divisions of the second type, to yield segments off the side, are infrequent and seem generally to involve only the fusiform initials. Behavior of the abscissed segments bears some relationship to size, the shortest segments usually failing, those of intermediate length tending to become reduced to one or more ray initials, and the largest developing as fusiform initials.
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