. The anatomy of woody plants. Botany -- Anatomy. 8o THE ANATOMY OF WOODY PLANTS black on the periphery of the stem. Centrally placed is the pith, surrounded by the woody cylinder, which in turn is circled by the phloem and the cortex. The woody tissues are encroached upon by three deep bays extending frojn the medulla and subtended by the three leaves. These extensions from the pith mark the presence of the leaf gaps, interrup- tions in the con- tinuity of the woody cylinder re- lated to the passing out of the foliar traces. Later the intervals in the. FIG. 60.—Tangential section of the wood
. The anatomy of woody plants. Botany -- Anatomy. 8o THE ANATOMY OF WOODY PLANTS black on the periphery of the stem. Centrally placed is the pith, surrounded by the woody cylinder, which in turn is circled by the phloem and the cortex. The woody tissues are encroached upon by three deep bays extending frojn the medulla and subtended by the three leaves. These extensions from the pith mark the presence of the leaf gaps, interrup- tions in the con- tinuity of the woody cylinder re- lated to the passing out of the foliar traces. Later the intervals in the. FIG. 60.—Tangential section of the wood of Casua- rina eqiiisetifolia. Explanation in the text. wood are covered by the activity of the cambium, so that the cylinder becomes continuous in the second or third year of growth. Clearly there is no structural feature of importance in the woody cylinder related to the leaf trace other than the foliar gap. This is the general situa- tion in the case of coniferous stems as well as in that of their Paleozoic ances- tors, the Cordaitales. Having diagrammatically compassed the organization of the stem in the coni- FlG' transverse section of a coniferous fers, we are in a position to consider the twig. Explanation in the text, case of such a dicotyledon as Casuarina. In Fig. 62 are reproduced the essential features of topography of a small branch in this genus. Leaves, as in the case of the conifer-. 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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