. The anatomy of woody plants. Botany -- Anatomy. FIG. 16.—a, transverse section of the bundle of an old root of Osmunda cinna- momea, showing primary wood complete; b, younger condition of the same with central region (metaxylem) of bundle still immature and containing protoplasm. condition. The outer regions of the oval mass of xylem are alone developed, the center being still occupied with thin cells filled with protoplasm. In the stem organs of the ferns and lower gymnosperms a some- what different mode of development of the primary wood is char- acteristically present. This may be illustr
. The anatomy of woody plants. Botany -- Anatomy. FIG. 16.—a, transverse section of the bundle of an old root of Osmunda cinna- momea, showing primary wood complete; b, younger condition of the same with central region (metaxylem) of bundle still immature and containing protoplasm. condition. The outer regions of the oval mass of xylem are alone developed, the center being still occupied with thin cells filled with protoplasm. In the stem organs of the ferns and lower gymnosperms a some- what different mode of development of the primary wood is char- acteristically present. This may be illustrated by reference to one of the fibrovascular strands of the bracken fern, Pteris aquilina. The smallest elements of the wood are situated in the woody tissue constituting the center of the bundle. As in the case of Lycopodium and its allies, the smaller first-formed cells belong to the protoxylem. The situation which presents itself in the later development of the woody strand of ferns, however, is usually quite different from that found in the lycopod series. In the ferns the tissues of the primary metaxylem, instead of lying entirely toward the center of the organ. 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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