. The essentials of botany. Botany. fMM TlSStJES OF PLAlftS. 17 40. Stony Tissue {Sclerenchyma).—In many plants the hard parts are composed of cells whose walls are thickened, often to a very considerable extent (Fig. 9). The cells are usually short, hut in some cases they are greatly elongated; they are sometimes regular in outline, but more frequently they are extremely irregular. They do not contain chloro-. FiG. 9.—stony tissue. A, from shell of Hickorjr-nut; B and C, from imder- ground stem of the common Brake (Pteris). Magnified 400 to 500 times. phyll, but in some cases (, in the pi
. The essentials of botany. Botany. fMM TlSStJES OF PLAlftS. 17 40. Stony Tissue {Sclerenchyma).—In many plants the hard parts are composed of cells whose walls are thickened, often to a very considerable extent (Fig. 9). The cells are usually short, hut in some cases they are greatly elongated; they are sometimes regular in outline, but more frequently they are extremely irregular. They do not contain chloro-. FiG. 9.—stony tissue. A, from shell of Hickorjr-nut; B and C, from imder- ground stem of the common Brake (Pteris). Magnified 400 to 500 times. phyll, but in some cases (, in the pith of apple-twigs) they contain starch. 41. Fibrous Tissue. — This is composed of elongated, thick-walled, and generally fusiform fibres (Fig. 10), whose walls are usually marked with simple or sometimes bordered pits. These fibres in cross-section are rarely square or round, but most generally three- to many-sided. They are found in, or in connection with, the woody bundles of ferns. 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 Bessey, Charles E. (Charles Edwin), 1845-1915. New York, Holt
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