. The elements of botany embracing organography, histology, vegetable physiology, systematic botany and economic botany ... together with a complete glossary of botanical terms. Botany. 94 HISTOLOGY AND ''!S. In Mosses, hairs, called rhizoids (Gr. rhiza, root), perform the function of roots ex- clusively, the latter being absent in these plants. In many hairs on aerial parts of plants, the ter- minal cell, or cluster of cells, becomes trans- formed into a secreting organ, in which gummy, resinous, or other substances are produced. These are termed glandular hairs (Fig. 210, gl)
. The elements of botany embracing organography, histology, vegetable physiology, systematic botany and economic botany ... together with a complete glossary of botanical terms. Botany. 94 HISTOLOGY AND ''!S. In Mosses, hairs, called rhizoids (Gr. rhiza, root), perform the function of roots ex- clusively, the latter being absent in these plants. In many hairs on aerial parts of plants, the ter- minal cell, or cluster of cells, becomes trans- formed into a secreting organ, in which gummy, resinous, or other substances are produced. These are termed glandular hairs (Fig. 210, gl). Eelated to these are the hairs of some Thistles, with elongated lashes. The leaves of the Sundew (Drosera) have stalked, sensitive glands, for the capture of insects upon which these plants partially feed. 120. The stomates (Gr. stoma, mouth) are minute ori- fices (Figs. 211, 212) in the epidermis, surrounded by two chlorophyll-bearing cells, called guard-cells (Fig. 211, g). Immediately under each stomate is an air cavity (Fig. 212, a). Stomates are never present in roots, seldom in sub- merged or underground stems; but exceedingly numerous on aerial stems and leaves. ^j. They are also met with at times on sepals, petals, and carpels of flowers. As a rule, they are more numerous on the lower than on the upper side of the leaf. On the upper 212 Fig, 211. Epidermis of Potato leaf, showing stomates (si) and guard-cells (g). Fig. 212. Section through the epidermis and stomate (^si) of Potato leaf; a, air 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 Kellerman, William Ashbrook, 1850-1908. Philadelphia, J. E. Potter and Company
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectbotany, bookyear1883
