. The anatomy of woody plants. Botany -- Anatomy. THE ROOT 161 as it forces its way through the more or less resistant soil. The tissues of the root usually become stiffened at an early stage by the rapid thickening of the walls of the tracheary elements of the primary wood. Rigidity is so much a necessity in the case of the wood of the root that ringed and spiral tracheids, such as ordinarily characterize the first-formed region of the xylem in the aerial stem, are conspicuous by their absence or at any rate by a scanty degree of development. In Fig. 117 are represented the protoxylem of the
. The anatomy of woody plants. Botany -- Anatomy. THE ROOT 161 as it forces its way through the more or less resistant soil. The tissues of the root usually become stiffened at an early stage by the rapid thickening of the walls of the tracheary elements of the primary wood. Rigidity is so much a necessity in the case of the wood of the root that ringed and spiral tracheids, such as ordinarily characterize the first-formed region of the xylem in the aerial stem, are conspicuous by their absence or at any rate by a scanty degree of development. In Fig. 117 are represented the protoxylem of the stem and root of the balsam fir. The great contrast in the development of the extensible ringed and spiral tracheids is shown. 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 Jeffrey, Edward C. (Edward Charles), b. 1866. Chicago, Ill. , The University of Chicago Press
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