. Plant life and plant uses; an elementary textbook, a foundation for the study of agriculture, domestic science or college botany. Botany. STRUCTURE 235. Fig. 83.—Epidermis of a leaf of lily, showing stomates. B. Stomates. — By far the most interesting feature of the epidermis is the stomates. These seem to be doing something. In Figure 83 you see among the cells of the epidermis numerous sausage-shaped cells which occur in pairs. These are the guard-cells of the stomates. The stomate itself is a slit-like opening in the surface of the leaf and it lies between the guard-cells. It opens direct
. Plant life and plant uses; an elementary textbook, a foundation for the study of agriculture, domestic science or college botany. Botany. STRUCTURE 235. Fig. 83.—Epidermis of a leaf of lily, showing stomates. B. Stomates. — By far the most interesting feature of the epidermis is the stomates. These seem to be doing something. In Figure 83 you see among the cells of the epidermis numerous sausage-shaped cells which occur in pairs. These are the guard-cells of the stomates. The stomate itself is a slit-like opening in the surface of the leaf and it lies between the guard-cells. It opens directly into the intercellular spaces of the mesophyll; a rather promi- nent intercellular space lies just be- neath it. (See Figure 79, page 220.) Stomates are usually very much more abundant on the under than on the upper side of leaves; often they are not found at all on the upper side. On leaves which stand erect they are about equally distributed on both sides, and on leaves which He on the surface of water, like those of the water lily, they occur only on the upper side. Usually, on the under sur- faces of leaves, stomates are very abundant; about sixty thousand to the square inch of leaf surface is common, and they have been found in such density as to indicate more than four hundred thousand to the square inch. Stomates are not confined to leaves. They are usually found in connection with any green tissues. They occur in the epidermis of young stems and fruits. Stomates have always been a puzzle to botanists and the puzzle is by no means settled yet; their behavior and the causes which control it are not yet satisfactorily ex- plained. By changes in the condition of the guard-cells, the stomates are opened or closed, but the causes of such. 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 Coulter, John
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
