. The plant cell, its modifications and vital processes; a manual for students. Plant physiology; Plant anatomy; Plant cells and tissues. OUTER CELLS AND TISSUES. 27 niesophyll cells of a leaf, or cortical cells of a stem ; they also allow of the exit of aqueous vapour during transpiration, a most important function, and also of oxygen during assimilation. A single stoma arises by the division of a young epidermal cell into two, and these separate slightly along the line of junction known as the middle lamella, leaving an opening which leads into the afore-mentioned space (see Fig. 16, a). The
. The plant cell, its modifications and vital processes; a manual for students. Plant physiology; Plant anatomy; Plant cells and tissues. OUTER CELLS AND TISSUES. 27 niesophyll cells of a leaf, or cortical cells of a stem ; they also allow of the exit of aqueous vapour during transpiration, a most important function, and also of oxygen during assimilation. A single stoma arises by the division of a young epidermal cell into two, and these separate slightly along the line of junction known as the middle lamella, leaving an opening which leads into the afore-mentioned space (see Fig. 16, a). The walls of these cells become greatly thickened, but the cell-contents persist; and a certain amount of apparent subsidence may take place, as in Pinus. so that ultimately the cells, which are known guard- cells, come to lie somewhat below the general level of the epidermis (see Fig. 15, h).. Fig. 12.—A Stoma from the Leaf of Smilax, seen in surface view. Tlif- two crescentic guard-cells possess cytoplasmic contents and 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 Haig, Harold Axel. London, C. Griffin and Company, Ltd.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectplantanatomy, bookyea
