. A manual of botany. Botany. 378 MANUAL OP BOTANY some few Dicotyledons it is many-layered. It is absent from the roots of Equisetum. Its cells are parenchymatous ; it does not show so mtioh differentiation as it does in the stem, rarely con- taining, when more than one layer of cells thick, any additional form of tissue except secretory ducts. When thickening of the roots occurs it gives rise to certain merismatio layers which Fig. Fig. 766. Section of stele of root. After Kny. en. Endodermis. pe. Peri- cycle, x. Xylem bundles, the protoxylem, :t„ abutting on the perlcycle. ph. Phloem
. A manual of botany. Botany. 378 MANUAL OP BOTANY some few Dicotyledons it is many-layered. It is absent from the roots of Equisetum. Its cells are parenchymatous ; it does not show so mtioh differentiation as it does in the stem, rarely con- taining, when more than one layer of cells thick, any additional form of tissue except secretory ducts. When thickening of the roots occurs it gives rise to certain merismatio layers which Fig. Fig. 766. Section of stele of root. After Kny. en. Endodermis. pe. Peri- cycle, x. Xylem bundles, the protoxylem, :t„ abutting on the perlcycle. ph. Phloem bundles alternating with the bundles of xylem. p. Pith, or conjunctive tissue of the stele. take an important share in the process. The vascular bundles vary in number, but the bast and the wood are never conjoined; they lie side by side with each other, on separate radii of the axis with a little conjunctive tissue between them. They are first noticeable as procambium strands, and gradually take on the forna of their permanent tissue. In the differentiation of the. 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 Green, J. Reynolds (Joseph Reynolds), 1848-1914. London, J. & A. Churchill
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