. Botany for high schools and colleges. Botany. 116 BOTANY. {h, h', h", li", Fig. 107). The last-named areelearly related to the vessels which surround them, and from which they differ only in their less diameter, and in having imperforate horizontal or oljlique septa. They are doubtless properly classed with the Tracheides (see p. 84). On the outer side of the trachcary portion just described lies a mass of narrow, somewhat elongated, thin-walled cells, wdiich constitute a true meristem tissue, to which the name of Cambium* has been given {c, c, Figs. lOG and 107). Next to the cambi
. Botany for high schools and colleges. Botany. 116 BOTANY. {h, h', h", li", Fig. 107). The last-named areelearly related to the vessels which surround them, and from which they differ only in their less diameter, and in having imperforate horizontal or oljlique septa. They are doubtless properly classed with the Tracheides (see p. 84). On the outer side of the trachcary portion just described lies a mass of narrow, somewhat elongated, thin-walled cells, wdiich constitute a true meristem tissue, to which the name of Cambium* has been given {c, c, Figs. lOG and 107). Next to the cambium. Fig. 105.—A very thin cross-section of the radial fibro-va?cular bundle of an old adventitious root of Acorvs calamus, g, the radial plates of tracheary tissue ; w, the sieve tissue alternating with the plates of tracheary tissue ; 5, the bundle-sheath; the tissue in the centre of the bundle is sclerenchyma. x 145.—After De Bary. lie, in order, sieve tissue and parenchyma; these do not occupy separate zones, but are more or less intermingled, forming a mass sometimes called the Soft Bast {y, y, y, Fig. 106, and p, Fig. 107). The sieve tissue includes sieve tubes and cambiform or latticed cells. In the extreme outer border of the bundle is amass of fibrous tissue {h, h, Figs. 106 and 107). The layer of starch-bearing cells just outside of the last- named tissue is the so-called bundle sheath. * Cambium, a low Latin word, meaning a liquid which becomes glutinous. The term was introduced when the real structure of the part to which it was applied was not 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 Bessey, Charles Edwin, 1845- [from old catalog]. New York, H. Holt and company
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