. Plant life, considered with special references to form and function. Plant physiology. 136 PLANT LIFE. 168. Steles.—The steles are numerous and ramify through the blade. Their structure is essentiall)- as described for the. Fig. 163.—Diagrammatic vertical section of a leaf. i\ i\ epidcrims, with cuticle <", c, and stomata J-/, .v/. t'.etween upper and lower epidermis lies llie mesophyl], witli cells abundantly supplied with chloroplasts. The upper row of elongated cells is the pali- sade parenchyma ; the rest form the spongy parenchyma, both witli many intercellular spaces /i, /, ?',
. Plant life, considered with special references to form and function. Plant physiology. 136 PLANT LIFE. 168. Steles.—The steles are numerous and ramify through the blade. Their structure is essentiall)- as described for the. Fig. 163.—Diagrammatic vertical section of a leaf. i\ i\ epidcrims, with cuticle <", c, and stomata J-/, .v/. t'.etween upper and lower epidermis lies llie mesophyl], witli cells abundantly supplied with chloroplasts. The upper row of elongated cells is the pali- sade parenchyma ; the rest form the spongy parenchyma, both witli many intercellular spaces /i, /, ?', commimicating with outside air tlirougii stomata. In the inesophyll lies a small vein, jiere cut across, composed of a ventral xylem bundle i', a dorsal phloem bundle j-, surrounded by the endodermis^'j", and the pericycle (between i' and^'.?).— After .Saclis. Stem (^1 127). Each of the suialler consists of httlc moie than a single pair of vascular bundles. The xylem bundles alone form the last branches (lig. 164), the phloem disajipear- ing earlier. The larger ribs may form one or two strands or a complete sheath of mechanical tissues b\- the de\'clopment of the pericycle, and the bundles proper mi\\ be iiKu-eascd by the development of secondary wood and bast. (See 1 14'-). 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 Barnes, Charles Reid, 1858-1910. New York, H. Holt & company
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