. Botany for agricultural students . Botany. 250 LEAVES In leaves having an oblique or vertical position, palisade tissue may be present also on the lower side. The spongy tissue, having fewer chloroplasts and so characterized on account of its loose structure, occupies the region between the palisade tissue and lower epidermis or the region between the palisade tissues when there is a lower palisade tissue present. It consists of cells irregu-. FiG. 232, — Cross section of a Tomato leaf, e, upper epidermis; c, cuti- cle; p, palisade cells; s, spongy cells; d, lower epidermis; si, stoma; g, gu
. Botany for agricultural students . Botany. 250 LEAVES In leaves having an oblique or vertical position, palisade tissue may be present also on the lower side. The spongy tissue, having fewer chloroplasts and so characterized on account of its loose structure, occupies the region between the palisade tissue and lower epidermis or the region between the palisade tissues when there is a lower palisade tissue present. It consists of cells irregu-. FiG. 232, — Cross section of a Tomato leaf, e, upper epidermis; c, cuti- cle; p, palisade cells; s, spongy cells; d, lower epidermis; si, stoma; g, guard cells of the stoma; h, stomatal chamber; v, vein; w, parenchyma sheath of the vein. The small bodies shown in the palisade and spongy cells are the chloroplasts. lar in shape and so loosely joined as to provide a system of air spaces which extend in all directions reaching from the stomata into the palisade tissues. In function, which is the manufacture of food, the palisade and spongy mesophylls are identical. Structurally chlorenchyma cells are well adapted to their function. Their thin cellulose walls permit water and sub- stances in solution to pass in or out readily. They have proto- plasm, which, as in all living cells, is the substance endowed with life and, therefore, able to regulate its activities. The cytoplasm (the name applied to all of the protoplasm except the nucleus) only partially fills the cell cavity, forming only a peripheral layer. In this peripheral layer the nucleus and also the chloro- plasts are located. Such an arrangement of the protoplasm. 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
