. The care of trees, in lawn, street and park [microform] : with a list of trees and shrubs for decorative use. Trees; Jardins; Arbres; Landscape gardening. Callusing and Repairing 93 place, of course, during the growing season only, and is due to division and enlargement of cambium cells mto wood, cork or bark cells. Since these cells preferably divide ver- ticallv or lengthwise, and since the assimilated food materials required in their growth arc carried from the foliage down- ward, the upper edges and the sides of the wound usually close more rapidly than the lower edges. For the same reas
. The care of trees, in lawn, street and park [microform] : with a list of trees and shrubs for decorative use. Trees; Jardins; Arbres; Landscape gardening. Callusing and Repairing 93 place, of course, during the growing season only, and is due to division and enlargement of cambium cells mto wood, cork or bark cells. Since these cells preferably divide ver- ticallv or lengthwise, and since the assimilated food materials required in their growth arc carried from the foliage down- ward, the upper edges and the sides of the wound usually close more rapidly than the lower edges. For the same reasons, a branch stub protruding from the trunk or larger branch heals more slowly, for here the cells must divide hori- zontally or crosswise, which they do with difficuhy; more- over, the cells, being out of the direct path between root and foliage, have to derive their food materials circui- tously from a neighboring branch, and are apt to find them less in quantity and less readily available than if a direct supply from the foliage o its own lost portion could have been had. Hence a vertical wound, running up or down the trunk or branch, is much less dangerous and more quickly covered than a much smaller wound running around the bole or branch, and similarlv, the wound made by the loss of a branch at its very base is more rapidly closed than when cut or broken above the b?se and across the diameter. Branch stubs are, therefore, apt to die back and to decay most readily, because longer exposed to the action of rot fungi without any vital process counteracting these fungi. In the case of small branchlets or twigs, which have been. j.'„; 2^ —Satisfactory growth of the callus over a pruned Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Fernow, B. E. (Bernhard Eduard), 1851-1923. New York : H. Holt
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License: Licensed
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyo, bookyear1910
