. The elements of botany embracing organography, histology, vegetable physiology, systematic botany and economic botany ... together with a complete glossary of botanical terms. Botany. 90 HISTOLOGY AND PHYSIOLOGY. psmdo-parmchyma (Fig. 204). lu prosenchyma the cells are always elongated, and have pointed ends wedged into one another (Figs. 205, 209, pros). 204 When the cell-walls are thickened and excessively hard (Fig. 206), the tissue is designated as sclerenchyma (Gr. scleras, hard). Beneath the epi- dermis of some plants tissue is found, whose cell-walls are thin, except at the corners, w
. The elements of botany embracing organography, histology, vegetable physiology, systematic botany and economic botany ... together with a complete glossary of botanical terms. Botany. 90 HISTOLOGY AND PHYSIOLOGY. psmdo-parmchyma (Fig. 204). lu prosenchyma the cells are always elongated, and have pointed ends wedged into one another (Figs. 205, 209, pros). 204 When the cell-walls are thickened and excessively hard (Fig. 206), the tissue is designated as sclerenchyma (Gr. scleras, hard). Beneath the epi- dermis of some plants tissue is found, whose cell-walls are thin, except at the corners, where they are thickened; and the word coUenchyma has been used to designate such (Fig. 207). 115. Vessels containing a milky juice (latex) are called laticiferous vessels (Fig. 208). Most of them arise by cell-fusion, and may form a net-work, penetrating the other tis- sue. The walls are generally thicker than that of the surrounding tissue. The latex is an emul- sion of several substances. Some of these, as Caoutchouc (India Eubber), Gutta-Percha, and Opium, are of great economic importance. In Euphorbia elongated grains of starch are found in the latex. Glands are secreting-cells, or clusters of cells, with character- istic contents,either odoriferous, acrid, colored, oily, or resinous, which "find no further use in changes connected with nutrition or ; The se- cretion may collect in the interior of the gland, as in case of Oil of Cam- phor ; or it may be discharged exter-. 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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