. The anatomy of woody plants. Botany -- Anatomy. CONIFERALES 319 wood normally shows the presence of only radial parenchyma, lon- gitudinal storage elements being absent. The longitudinal radial section of the wood (Fig. 226) shows a condition of pit- ting resembling that found in the Cordai- tales, namely, one which is alternating and characterized by the absence of the bars of Sanio. The absence of wood parenchyma and the alternating char- acter of the pitting are features which at first sight would. seem to justify the assumption of a FIG. 225.—Transverse section of the wood of Agathis a u
. The anatomy of woody plants. Botany -- Anatomy. CONIFERALES 319 wood normally shows the presence of only radial parenchyma, lon- gitudinal storage elements being absent. The longitudinal radial section of the wood (Fig. 226) shows a condition of pit- ting resembling that found in the Cordai- tales, namely, one which is alternating and characterized by the absence of the bars of Sanio. The absence of wood parenchyma and the alternating char- acter of the pitting are features which at first sight would. seem to justify the assumption of a FIG. 225.—Transverse section of the wood of Agathis a ustralis. close degree of rela- tionship between the araucarian coni- fers and the Cordai- tales, and this view of their affinities has been the one almost universally adopted. Before we inquire as to its validity it is necessary to exam- ine the organization of Mesozoic repre- sentatives of the group. In Fig. 227 is shown in trans- verse section the. 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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