. Introduction to botany. Botany. 36 INTEODUCTION TO BOTANY 34. Internal structure of the leaf. An idea of the inner structure is best obtained by examining a cross section of a simple leaf. In general, three kinds of cells appear within the epidermis, and these are variously arranged in different kinds of plants. In simple leaves, such as that shown in figure 26, almost all the cells contain the green coloring matter, chloro- phyll (meaning " leaf green "). These chlorophyll-bearing cells are long and are arranged side by side (^palisade tissue) or are. Pig. 26. Cross section of a g
. Introduction to botany. Botany. 36 INTEODUCTION TO BOTANY 34. Internal structure of the leaf. An idea of the inner structure is best obtained by examining a cross section of a simple leaf. In general, three kinds of cells appear within the epidermis, and these are variously arranged in different kinds of plants. In simple leaves, such as that shown in figure 26, almost all the cells contain the green coloring matter, chloro- phyll (meaning " leaf green "). These chlorophyll-bearing cells are long and are arranged side by side (^palisade tissue) or are. Pig. 26. Cross section of a geranium leaf a, air space; , air chamber; e, upper epidermis; e', lower epidermis; p, pali- sade cells; s, stoma; sp, spongy parenctiyma (usually spongy parenchyma has fewer chloroplasts than the palisade tissue); v, vein. Magnified 150 times. After drawing by Mrs. F. E. Clements more irregular in form and loosely arranged (spongy tissue). Air spaces are abundant between these cells, but they are larger and more abundant in the spongy tissue than in the palisade tissue. When a single layer of palisade tissue and one of spongy tissue are present, the palisade tissue lies next to the upi^er surface of the leaf and the spongy tissue next to the lower surface; but frequently there is a lower layer of palisade tissue, not so well developed as the upper one. In cross sections of leaves the veins apjoear as masses of small, thick-walled cells closely crowded together and usually lying about midway between the upper and lower surfaces of the 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 Bergen, Joseph Y. (Joseph Young), 1851-1917; Caldwell, Otis William, 1869- joint author. Boston, New York, [etc. ] Ginn and company
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