. Outlines of plant life : with special reference to form and function . Botany. THE LEAVES. 109 (See also \ 93.) The leaves of buds are sometimes thick- ened by the deposit of food material, and when such buds loosen from the plant they may produce a new plant, as in the tiger-lily (see \ 299). Both base and blade may be used for storage, as in the century-plant; or the entire leaf may serve the same purpose, as in the cultivated cabbage. 136. Structure.—Three regions in each part may be distinguished, as in the root and stem : (i) the epidermis ; (2) the cortex ; both continu- ous with that
. Outlines of plant life : with special reference to form and function . Botany. THE LEAVES. 109 (See also \ 93.) The leaves of buds are sometimes thick- ened by the deposit of food material, and when such buds loosen from the plant they may produce a new plant, as in the tiger-lily (see \ 299). Both base and blade may be used for storage, as in the century-plant; or the entire leaf may serve the same purpose, as in the cultivated cabbage. 136. Structure.—Three regions in each part may be distinguished, as in the root and stem : (i) the epidermis ; (2) the cortex ; both continu- ous with that of the stem ; (3) the steles, continuous with those of the stem when the latter contains several steles, or branches of it when the stem contains a single stele. The structure of the petiole agrees in all essentials with that of the stem (see Tf 107, fl.). The following is a brief summary of the structure of the blade of a foliage Fig. io4.«—Surface view of epidermis from under side of leaf of braclcen fern {Pteris), showing wavy cells, except over veins, v, where they 'are elongated, st, stomata. The dot in each cell represents the nucleus. Highly magnified.—After Sedgwick and Wilson. 137. Epidermis.—In broad leaves, the epidermis of the blade is made up of tabular cells, often with wavy lateral walls (fig. 104), and, except in shade plants, usually without green color. It usually consists of one layer, but in some plants becomes several-layered, either to serve as ad-. 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 Barnes, Charles Reid, 1858-1910. New York : Henry Holt and Company
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