. The anatomy of woody plants. Botany -- Anatomy. CORDAITALES AND GINKGOALES 307. elements of the secondary wood. This is well shown in Fig. 220. Among the living conifers this condition is most nearly paralleled by the Abietineae. The foliar trace is of course of great importance in this as in other ancient gy m n o s p erms . Fig. 221 illustrates the organization of one of the bundles of a broad cordai- tean leaf (Cordaites principalis) in both transverse and longitudinal section. In a is shown the transverse topog- \\ f fVi t r\ FIG. 217.—Cordaitean wood from England and it is clear that th
. The anatomy of woody plants. Botany -- Anatomy. CORDAITALES AND GINKGOALES 307. elements of the secondary wood. This is well shown in Fig. 220. Among the living conifers this condition is most nearly paralleled by the Abietineae. The foliar trace is of course of great importance in this as in other ancient gy m n o s p erms . Fig. 221 illustrates the organization of one of the bundles of a broad cordai- tean leaf (Cordaites principalis) in both transverse and longitudinal section. In a is shown the transverse topog- \\ f fVi t r\ FIG. 217.—Cordaitean wood from England and it is clear that the centripetal wood is well developed, ending upwardly in large elements which are pitted in their char- acter. In the par- ticular instance figured there hap- pens to be no devel- opment of the centrifugal xylem, so that the phloem abuts immediately on the protoxylem. With the flanks of the metaxylem is connected a zone of narrow thick-walled FIG. 218.—Cordaitean wood from Prince Edward Island elements which form. 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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