. Botany for high schools and colleges. Botany. QYMNUaPERMM. m ^surface. In many cases oil or resin receptacles occur in, or immediately beneath, the epidermis. 516.—The fibro-vascular bundles are for the most part of the collateral form, and in the young stem they are ar- ranged so as to form an inner xylem cylinder ensheathed by a phloem cylinder (Fig. 301). The xylem of these first- formed bundles is composed of an inner mass of annular and spiral vessels, which gradually pass outwardly into tracheides. The phloem is mostly composed of an outer mass of bast hrKA:U\:'. WHc^^^^nt !«.—Cr
. Botany for high schools and colleges. Botany. QYMNUaPERMM. m ^surface. In many cases oil or resin receptacles occur in, or immediately beneath, the epidermis. 516.—The fibro-vascular bundles are for the most part of the collateral form, and in the young stem they are ar- ranged so as to form an inner xylem cylinder ensheathed by a phloem cylinder (Fig. 301). The xylem of these first- formed bundles is composed of an inner mass of annular and spiral vessels, which gradually pass outwardly into tracheides. The phloem is mostly composed of an outer mass of bast hrKA:U\:'. WHc^^^^nt !«.—CroPB-section throii£*h the new wood (/i-A). cambinm f x - x), and bark '(6-6) of the stem of Junimnta communifi^ made at Mie end ot Si'ptember. ra, «i, nie- -duUary rays. In the tiarK are shown the layers of bast fibres, b, b. b. Magnified.— After De Bary. fibres, which is bordered intei-nally by a mass of sieve tissue (latticed or cambiform cells) and parenchyma. Between the xylem and the phloem a layer of cells always remains as a meristem tissue ; this constitutes the cambium layer of the bundles (c. Fig. 301, B., and X-X, Fig. 301a). 517.—The increase in the diameter of the stem takes place by the multiplication of cells in the cambium layer ; the cambium cells undergo longitudinal fission by the forma- tion of partitions at right angles to the radii; these new cells. 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 Bessey, Charles E. (Charles Edwin), 1845-1915. New York : H. Holt
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectbotany, bookyear1888
