. Botany; an elementary text for schools. Plants. 256 TISSUES but with thinner walls and the central cavity not so nearly closed. In some cases such fibers have transverse walls. Wood cells constitute a large part of the wood of some plants and are in other cases found scattered only among the other prosenchyma. (3) Tracheids. Cells of this tissue differ from ordinary cells in being supplied with numerous bordered pits or other characteristic 398. Longitudinal tangentiiil section of Scotch pine wood, liighly magnified. It shows tracheids with bordered pits. The dark cells are ends o
. Botany; an elementary text for schools. Plants. 256 TISSUES but with thinner walls and the central cavity not so nearly closed. In some cases such fibers have transverse walls. Wood cells constitute a large part of the wood of some plants and are in other cases found scattered only among the other prosenchyma. (3) Tracheids. Cells of this tissue differ from ordinary cells in being supplied with numerous bordered pits or other characteristic 398. Longitudinal tangentiiil section of Scotch pine wood, liighly magnified. It shows tracheids with bordered pits. The dark cells are ends of medullary rays. They constitute the largest part of the wood of the pines and other gymnosperms. Fig. 398. (4) Vascular tissue, composed of large cells which become confluent end to end, forming long tubes or ducts. TT', Fig. 401. From the thickened markings which these cells bear they are named spiral, annular, pitted, scalariform, etc. Fig. 389. These vessels are often of considerable length, but are never con- tinuous through the entire plant. Cut a grape-vine stem 2 or 3 feet long. Place one cut end in a glass of water and with the other end in the mouth, try to force air through the stem. If not successful, shorten the stem a 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 Bailey, L. H. (Liberty Hyde), 1858-1954. New York, Macmillan Co.
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