. A textbook of botany for colleges and universities ... Botany. (leptome), mechanical elements (stereome), and undifferentiated parenchyma. The position of the hadrome cells in the upper portion of the vein just above the leptome (fig. 760) and near the palisade cells may be advantageous, since the amount of water transported greatly exceeds the combined amount of other substances. Near the ends of the veinlets there are no tracheae, but chiefly tracheids which frequently diverge in such a way as to increase the area of the diffusing sur- face (fig. 936); com- monly they are sur- rounded by a
. A textbook of botany for colleges and universities ... Botany. (leptome), mechanical elements (stereome), and undifferentiated parenchyma. The position of the hadrome cells in the upper portion of the vein just above the leptome (fig. 760) and near the palisade cells may be advantageous, since the amount of water transported greatly exceeds the combined amount of other substances. Near the ends of the veinlets there are no tracheae, but chiefly tracheids which frequently diverge in such a way as to increase the area of the diffusing sur- face (fig. 936); com- monly they are sur- rounded by a sheath of mesophyll cells. Mechanical tis- sues in leaves. — Mechanical leaf tis- sues, while mostly lacking in hydro- phytes and not espe- cially well developed in mesophytes, are developed promi- nently in many xero- phytes, particularly in those with stiff evergreen leaves, Fig. 936.—A longitudinal radial section of a leaf of the hop tree (Ftelea trifoliata) near the end of a vein,^showing a bundle terminus with its tracheids (<), surrounded by a bundle sheath (b); note that the upper chlorenchyma consists of palisade cells (^), which at the leaf margin grade into the cells char- acterizing the lower chlorenchyma (5); highly the so-called 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 Coulter, John Merle, 1851-1928; Barnes, Charles Reid, 1858-1910, joint author; Cowles, Henry Chandler, 1869- joint author. New York, Cincinnati [etc] American book company
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1910
