. Plant anatomy from the standpoint of the development and functions of the tissues, and handbook of micro-technic. Plant anatomy. 58 SECONDARY INCREASE IN THICKNESS formed outside of it, and so on (Fig. 30, C). A peculiar type is found in the climbing Serjanias of the family Sapindacese where the stem is traversed vertically by several ridges, which in cross section look like lobes, each containing a circle of vascular bundles surrounding a pith; and the center of the stem is occu-. Fig. 29.—Portion of a cross section through the stem of Draciena marginata. P, parenchyma of cortex. V, meriste
. Plant anatomy from the standpoint of the development and functions of the tissues, and handbook of micro-technic. Plant anatomy. 58 SECONDARY INCREASE IN THICKNESS formed outside of it, and so on (Fig. 30, C). A peculiar type is found in the climbing Serjanias of the family Sapindacese where the stem is traversed vertically by several ridges, which in cross section look like lobes, each containing a circle of vascular bundles surrounding a pith; and the center of the stem is occu-. Fig. 29.—Portion of a cross section through the stem of Draciena marginata. P, parenchyma of cortex. V, meristematic zone of the pericycle by the activity of which the stem increases in diameter, with the addition of new vascular bundles. M, mature vascular bundle. iV, nearly mature vascular bundle. O, newly formed procambium strand from which a vascular bundle is to arise. B, beginning of a procambium strand by the division of cells in the meristematic zone. F, parenchyma of the fundamental tissue. (After Haberlandt.) pied by a circle of vascular bundles in the usual way. The stem is ridged when first formed from the primordial meristem, and the primary bundles, following the contour of the stem are laid down in the form of a lobed circle, as seen in cross section. When the interfascicular cambium is formed it extends across the base of each lobe, cutting it off from the central or main part; and then it completes the circle of bundles in each lobe and also the central circle, so that each xylem or wood cylinder is entire and surrounded by a phloem 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 Stevens, William Chase, 1861-. Philadelphia, P. Blakiston's Son
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectplantanatomy, bookyea
