. Beginners' botany. Botany. THE STEM—ITS GENERAL STRUCTURE 63 why dicotyledonous bundles form rings of wood and mono- cotyledonous cannot (Figs. 75 and y6). The dicotyledon- ous bundle (Fig. j6) has, running across it, a layer of brick- shaped cells called cambium, which cells are a specialized form of the parenchyma cells and retain the power of. Fig. 76. — The Dicotyledonous Bundle or Wood Strand. Upper figure is of moonseed : c", cambium ; (/, ducts ; i, end of first year's growth ; :!, end of second year's growth ; bast part at left and wood part at right. Lower figure (from Wettstei
. Beginners' botany. Botany. THE STEM—ITS GENERAL STRUCTURE 63 why dicotyledonous bundles form rings of wood and mono- cotyledonous cannot (Figs. 75 and y6). The dicotyledon- ous bundle (Fig. j6) has, running across it, a layer of brick- shaped cells called cambium, which cells are a specialized form of the parenchyma cells and retain the power of. Fig. 76. — The Dicotyledonous Bundle or Wood Strand. Upper figure is of moonseed : c", cambium ; (/, ducts ; i, end of first year's growth ; :!, end of second year's growth ; bast part at left and wood part at right. Lower figure (from Wettstein) is sunflower: h^ wood- cells: ^.vessels; t-, cambium; j^, fundamental tissue or parenchyma: ^, bast; ^/, bast parenchyma; j, sieve-tubes. growing and multiplying. The bundles containing cam- bium are called open bundles. There is no cambium in monocotyledonous bundles (Fig. 75) and the bundles are called closed bundles. Monocotyledonous stems soon cease to grow in diameter. The stem of a palm tree is almost. 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 Bailey, L. H. (Liberty Hyde), 1858-1954. New York, The Macmillan company
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