. Science of plant life, a high school botany treating of the plant and its relation to the environment. Botany. 124 Science of Plant Life. Fig. 72. Cross section of a portion of bamboo stem photographed through a microscope. The large openings in each bundle are the water-conducting tubes. that is made up of them is called the bast. Bast may be seen in the stringy fibers on a grapevine or in the bark of trees. It is the bast fibers from flax, hemp, jute, and other dicotyledonous plants that are used in the manufac- ture of thread and cordage. The cells of the mechanical tissue on the water-co
. Science of plant life, a high school botany treating of the plant and its relation to the environment. Botany. 124 Science of Plant Life. Fig. 72. Cross section of a portion of bamboo stem photographed through a microscope. The large openings in each bundle are the water-conducting tubes. that is made up of them is called the bast. Bast may be seen in the stringy fibers on a grapevine or in the bark of trees. It is the bast fibers from flax, hemp, jute, and other dicotyledonous plants that are used in the manufac- ture of thread and cordage. The cells of the mechanical tissue on the water-conducting side of the bundle are some- what shorter and thicker than the bast fibers. They are known as wood fibers and make up what is properly called the wood, although in most dicots the wood fibers are mixed with the water-conducting vessels, and the whole inner part of the bimdle is known as wood. In woody plants this me- chanical tissue is present in abimdance and forms the bulk of the stem. The lumber that is obtained from dicotyledon- ous trees is derived from the inner parts of the bundles and is made up of wood fibers and water-conducting tissues. The cambium is a layer of soft tissue between the two sides of the bundle. It is the principal growing tissue of the dicot stem. GroAivth takes place in it by the longitudinal division of the cells. On its inner face the cells of the cambium layer change into water-conducting cells or wood fibers; on its outer face they change into food-conducting cells or bast fibers. In this way the bundles of perennial dicots enlarge from year to year, and this causes the stem to increase in thickness. In a tree the cambium cells form a continuous. 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 Transeau, Edgar Nelson, 1875-1960. Yonkers-on-Hudson, N. Y. , World Book Co
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectbotany, bookyear1921
