. The anatomy of woody plants. Botany -- Anatomy. CONIFERALES 333 elements are arranged in radial rows and usually increase in size toward the upper surface of the leaf. In the xylem directed down- ward are seen indications of wood rays, and the inspection of the longitudinal aspect reveals the fact that it is made up largely of tracheids with bordered pits. This is the centrifugal xylem and corresponds to the mass of wood in the foliar trace of the fascicular. FIG. 241.—Portion of leaf of Prepimis statenensis leaves of living pines. The upwardly developing wood is the cryptogamic xylem and co
. The anatomy of woody plants. Botany -- Anatomy. CONIFERALES 333 elements are arranged in radial rows and usually increase in size toward the upper surface of the leaf. In the xylem directed down- ward are seen indications of wood rays, and the inspection of the longitudinal aspect reveals the fact that it is made up largely of tracheids with bordered pits. This is the centrifugal xylem and corresponds to the mass of wood in the foliar trace of the fascicular. FIG. 241.—Portion of leaf of Prepimis statenensis leaves of living pines. The upwardly developing wood is the cryptogamic xylem and confirms the conclusion as to the affinity of Prepinus, already suggested by the organization of its trans- fusion sheath, namely, that the genus is allied to the Cordaitales. It is thus apparent that the details of organization of the leaf in Prepinus, which in turn is clearly the ancestor of Pinus, justify an attribution of cordaitean ancestry to the Abietineae. This conclusion as to relationship is supported by the primitively cor- daitean character of the pitting which so strikingly indicates 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 Jeffrey, Edward C. (Edward Charles), b. 1866. Chicago, Ill. , The University of Chicago Press
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