. The plant cell, its modifications and vital processes; a manual for students. Plant physiology; Plant anatomy; Plant cells and tissues. 5 2 THU PLANT CELL. bundles, xylem upon its inner aspect and phloem upon its outer aspect, but, as will be readily understood, there is no protoxylem or protophloem to be seen in these portions, as they are secondary formations (see Figs. 30, 31, and 32, ifc). The fascicular and interfascicular cambium unite during the first year's growth, and thus is produced a complete ring of meristem in stem (or root) which gives rise to fresh annual rings of xylem and p
. The plant cell, its modifications and vital processes; a manual for students. Plant physiology; Plant anatomy; Plant cells and tissues. 5 2 THU PLANT CELL. bundles, xylem upon its inner aspect and phloem upon its outer aspect, but, as will be readily understood, there is no protoxylem or protophloem to be seen in these portions, as they are secondary formations (see Figs. 30, 31, and 32, ifc). The fascicular and interfascicular cambium unite during the first year's growth, and thus is produced a complete ring of meristem in stem (or root) which gives rise to fresh annual rings of xylem and phloem (see Figs. 31, 32, 33). The whole process is known as secondary thickening. In roots, although the ultimate disposition of xylem, cambium, and phloem is similar to that just described, the protoxylem and protophloem alternate with one another, and are not situated upon the same radial lines in the young Fig. 35.—Diagram of a Transverse Section through a Young Mono- OOTYLEDONOUS STEM—e, Epidermis; /, fundamental tissue ; h, fibro- vascular bundles (black = xylem, dotted = phloem). In the Monocotyledons ;uid higher Ferns no persistent ring of meristem analogous to the cambium of Dicotyledons exists, and the fibro-vascular bundles are made up of xylem and phloem formed early from certain rudimentary elements; generally speaking, in Monocotyledons, the phloem is found between th& arms of a V-shaped mass of xylem (see Fig. 35); whilst in the higher Ferns the phloem surrounds a centrally situated mass of xylem in each separate bundle. Thus the bundles of JMonocoty- ledons and Ferns are termed " closed " bundles, in contradistinc- tion to those of Dicotyledons and Conifers, which are known as. 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 Haig, Harold Axel. London, C. Griffin and Co
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