. Botany of the living plant. Botany; Plants. Fig. 37. Diagrams of secondary thickening in stem of Dicotyledon, based on transverse sections of the hypocotyl of Ricinus. A represents the stem before origin of inter- fascicular cambium. B, same after it has been formed. C, after it has produced internally a broad ring of secondary wood, and externally a narrower ring of secon- dary phloem. 2? = primary cortex. M=pith. £=phloem. #=primary xylem. 6 = bast fibres at periphery of phloem, fc = fascicular cambium. ic = interfascicular cambium, fh = wood of primary bundle. i/fe = wood developed from i
. Botany of the living plant. Botany; Plants. Fig. 37. Diagrams of secondary thickening in stem of Dicotyledon, based on transverse sections of the hypocotyl of Ricinus. A represents the stem before origin of inter- fascicular cambium. B, same after it has been formed. C, after it has produced internally a broad ring of secondary wood, and externally a narrower ring of secon- dary phloem. 2? = primary cortex. M=pith. £=phloem. #=primary xylem. 6 = bast fibres at periphery of phloem, fc = fascicular cambium. ic = interfascicular cambium, fh = wood of primary bundle. i/fe = wood developed from inter- fascicular cambium. ifp = phloem developed from interfascicular cambium. By the intercalation of the secondary tissues the primary bast, b, b, b, is removed some distance from the primary wood x, x. In C the principal medullary rays extend the whole distance through the ring, the secondary rays only part of that distance. (After Sachs.) Three different results accrue from the growth of the vascular column, viz. increased power of conduction, of storage, and of mechanical resistance. Three different types of tissue are involved, and though differing in detail, all of these are to be found as a rule both in the internal woody column and in the external band of bast. The tissues in question are, the vessel for conduction, the parenchymatous. 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 Bower, F. O. (Frederick Orpen), 1855-1948; Wardlaw, C. W. (Claude Wilson), 1901-. London, Macmillan and Co. , ltd.
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