. The essentials of botany. Botany. 24 BOTANY. The vessels are usually of wide diameter; in some forms they are crossed at frequent intervals by perforated hori- zontal or inclined septa (Fig. 17); in other forms they have fusiform extremities. 52. (4) Tracheids.—These consist for the most part of single closed cells; other- wise they possess the characters of vessels. In one form (Fig. 18), as in the so-called wood-cells of Conifers, they are interme- diate in structure hetween the pitted ves- sels and the fibres of the wood of other. Frs. 16. FiQ. 17. Fig. 16.—Soalariform vessels of the comm
. The essentials of botany. Botany. 24 BOTANY. The vessels are usually of wide diameter; in some forms they are crossed at frequent intervals by perforated hori- zontal or inclined septa (Fig. 17); in other forms they have fusiform extremities. 52. (4) Tracheids.—These consist for the most part of single closed cells; other- wise they possess the characters of vessels. In one form (Fig. 18), as in the so-called wood-cells of Conifers, they are interme- diate in structure hetween the pitted ves- sels and the fibres of the wood of other. Frs. 16. FiQ. 17. Fig. 16.—Soalariform vessels of the common Brake (Pteris). Fie. 17.—Pitted vessels of Dutchman's Pipe (Aristolochia sipho), from a longi- tudinal section of the stem; the vessel on the right is seen in section, that on the left from without, a, a, rings, which are remnants of the original trans- verse partitions; 6, 6, sections of the walls. flowering plants. Every gradation between these tracheids and the other forms of tracheary tissue occur. In another form, as in the wood of many common trees and shrubs, the tracheids are shorter than in the preceding, quite. 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 E. (Charles Edwin), 1845-1915. New York : H. Holt and company, ;
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