. The anatomy of woody plants. Botany -- Anatomy. belonging to the fundamental system can readily be distinguished. It may be stated in a general way that the higher vascular plants have their skeletal tissues developed from the progressive mechanical differentia- tion of the primitively solely water-conducting fibrovascular system, in contrast to the Pteri- dophyta, in which the mechanical function mainly resides in the fundamental system. In the higher vascular groups not only does the mechanical principle find its best expression FIG. section of young root jn connection with
. The anatomy of woody plants. Botany -- Anatomy. belonging to the fundamental system can readily be distinguished. It may be stated in a general way that the higher vascular plants have their skeletal tissues developed from the progressive mechanical differentia- tion of the primitively solely water-conducting fibrovascular system, in contrast to the Pteri- dophyta, in which the mechanical function mainly resides in the fundamental system. In the higher vascular groups not only does the mechanical principle find its best expression FIG. section of young root jn connection with the of the balsam fir. Explanation in the text. fibrovascular system, but the fundamen- tal category of tissues becomes relatively insignifi- cant in amount, particularly in stems with peren- nial growth. Fur- ther, the bound- aries between the fibrovascular and fundamental tis- sues have gen- erally disappeared through the de- generacy of the endodermis. In the case of the root of all vascular plants the limit between the conductive strands and the fundamental system is clearly marked from the lowest forms to those at the very summit of the vascular. FIG. 99.—Older root of the balsam fir. 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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