. The anatomy of woody plants. Botany -- Anatomy. v£/^\S/V-\V2/ 0. FIG. 80.—Lateral pitting of vessels of dicotyledons. Explanation in the text In c is shown the characteristic pitting of the vessels of the vine family (Vitaceae). Here the sculpture of the lateral walls consists of elongated slits closed by equally elongated membranes. A reference to the structure of the secondary wood in the region of the pith in this instance makes it clear that the slitlike pits of the Vitaceae are not persistent scalariform pores of the first-formed region of the xylem, but are the result of the lateral fu
. The anatomy of woody plants. Botany -- Anatomy. v£/^\S/V-\V2/ 0. FIG. 80.—Lateral pitting of vessels of dicotyledons. Explanation in the text In c is shown the characteristic pitting of the vessels of the vine family (Vitaceae). Here the sculpture of the lateral walls consists of elongated slits closed by equally elongated membranes. A reference to the structure of the secondary wood in the region of the pith in this instance makes it clear that the slitlike pits of the Vitaceae are not persistent scalariform pores of the first-formed region of the xylem, but are the result of the lateral fusion of horizontal rows of pits in the side walls of the vessels. Iri d is represented a condition of structure of the vascular wall which is common in the higher types of dicotyledonous woods. Here the alternating pitting is overlaid internally by spiral structures which it is customary to call tertiary thickenings. In concluding the statements in regard to vessels it is necessary to refer to the phenomenon of tylosis or occlusion of the lumina or cavities of the vessels by parenchymatous ingrowths. These. 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 Jeffrey, Edward C. (Edward Charles), b. 1866. Chicago, Ill. , The University of Chicago Press
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