. The care of trees in lawn, street and park. With a list of trees and shrubs for decorative use. Trees; Trees. Callusing and Repairing 93 place, of course, during the growing season only, and is due to division and enlargement of cambium cells into wood, cork, or bark cells. Since these cells preferably divide ver- tically or lengthwise, and since the assimilated food materials required in their growth are carried from the foliage down- ward, the upper edges and the sides of the wound usually close more rapidly than tlie lower edges. For the same reasons, a branch stub protruding from the tru
. The care of trees in lawn, street and park. With a list of trees and shrubs for decorative use. Trees; Trees. Callusing and Repairing 93 place, of course, during the growing season only, and is due to division and enlargement of cambium cells into wood, cork, or bark cells. Since these cells preferably divide ver- tically or lengthwise, and since the assimilated food materials required in their growth are carried from the foliage down- ward, the upper edges and the sides of the wound usually close more rapidly than tlie lower edges. For the same reasons, a branch stub protruding from the trunk or larger brancli heals more slowl}-, for here the cells must divide hori- zontally or crosswise, which they do with difficult}-; more- over, the cells, being out of the direct path between root and foHage, have to deri\'e their food materials circui- touslv from a neishborincf. Fig. 2T,. â Satisfactory growth of the callus over a pruned branch. branch, and are apt to tind them less in quantity and less readily available than if a direct supply from the foliage of 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 similarly, the wound made by the loss of a branch at its very base is more rapidly closed than when cut or broken above the base and across the diameter. Branch stubs are, therefore, apt to die back and to decay most readily, longer exposed to the action of rot fungi without any ^â ital process counteracting these fungi. In the case of small branchlels or twigs, wliich have been. 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 Holt
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