. Lessons in botany. Botany. HOW WATER MOVES THROUGH THE PLANT. 57. Fig. 48. Fig 49. Stoma open. Stoma closed. Figures 48, 49. - Section through stomata of ivy leaf. faces of the leaf and are termed the epidermis. Their walls are quite stout and the outer walls are culicularized. 100. Soft tissue of the leaf.—The cells which contain the green chlorophyll bodies are arranged in two different ways. Those on the upper side of the leaf are usually long and pris- matic in form and lie closely parallel to each other. Because of this arrangement of these cells they are termed • the palisade cells, an
. Lessons in botany. Botany. HOW WATER MOVES THROUGH THE PLANT. 57. Fig. 48. Fig 49. Stoma open. Stoma closed. Figures 48, 49. - Section through stomata of ivy leaf. faces of the leaf and are termed the epidermis. Their walls are quite stout and the outer walls are culicularized. 100. Soft tissue of the leaf.—The cells which contain the green chlorophyll bodies are arranged in two different ways. Those on the upper side of the leaf are usually long and pris- matic in form and lie closely parallel to each other. Because of this arrangement of these cells they are termed • the palisade cells, and form what is called the palisade layer. The other green cells, lying below, vary greatly in size in different plants and to some extent also in the same plant. Here we notice that they are elongated, or oval, or somewhat irregular in form. The most striking peculiarity, however, in their arrange- ment is that they are not usually packed closely together,but each cell touches the other adjacent cells only at certain points. This arrangement of these cells forms quite large spaces between them, the intercellular spaces. If w e should examine such a sec- tion of a leaf before it is mounted in water we Portion of epidermis of ivy, showing irregular epidermal cells, stoma WOUlQ See and guard cells. ,, . ,, that the in- tercellular spaces are not filled with water or cell-sap, but are filled with air or some gas. Within the cells, on the other hand, we find the cell-sap and 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 Atkinson, George Francis, 1854-1918. New York, H. Holt and company
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