. Botany for agricultural students . Botany. STRUCTURE OF WOODY STEMS 199 ing the bark and wood, reaching part way or all the way to the pith. The bark, characteristic of woody plants, is originated by the cork cambium which forms as an inner layer of the epidermis or in the cortex beneath. {Fig. 178.) As the branch increases in diameter, the epidermis seldom grows in proportion, but usu-. FiG. 178. â Diagrammatic drawing of a cross section of an apple twig after completing two seasons growth, e, epidermis sloughing off; k, cork; h, cork cambium; i, inner cortex; /(, the phloem formed the firs
. Botany for agricultural students . Botany. STRUCTURE OF WOODY STEMS 199 ing the bark and wood, reaching part way or all the way to the pith. The bark, characteristic of woody plants, is originated by the cork cambium which forms as an inner layer of the epidermis or in the cortex beneath. {Fig. 178.) As the branch increases in diameter, the epidermis seldom grows in proportion, but usu-. FiG. 178. â Diagrammatic drawing of a cross section of an apple twig after completing two seasons growth, e, epidermis sloughing off; k, cork; h, cork cambium; i, inner cortex; /(, the phloem formed the first sea-son; â p, phloem formed the second season; c, cambium; x, xylem formed the first season; y, xylem formed the second season. ally dies and sloughs off, and its protective function is assumed by the cork formed beneath and gradually thickened as the stem grows older. In some cases the cork cambium produces cortex cells on its inner side as well as cork on its outer side, in which case the cortex is increased in thickness. Since cork is imper- vious to water, the tissues on its outside, having their water supply cut off, soon die and with the epidermis and cork form. 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 Martin, John N. (John Nathan), b. 1875. New York : John Wiley & Sons, Inc.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1919
