. Botany for high schools and colleges. Botany. FiG. 13B. I^Q. \AA. Fig. 14. Fig. 13.—A, optical section of a pclerenchyma-cell from beneath tlie epidennis of the underground st m of Pl&i^s aquilina, isolated by SchulzeV maceration Tlie wall consists of an innt^r very dense layer, and a central less dense one enclosed between two denser ones; these layers are penetrated by pit channels, which are seen in the further wall in transverse section. B^ a similar cell, more thickened. The pits are here long cana's, which are more or less branctied. X about 550.— After Sachs. Kg. 14.—Brown-walled
. Botany for high schools and colleges. Botany. FiG. 13B. I^Q. \AA. Fig. 14. Fig. 13.—A, optical section of a pclerenchyma-cell from beneath tlie epidennis of the underground st m of Pl&i^s aquilina, isolated by SchulzeV maceration Tlie wall consists of an innt^r very dense layer, and a central less dense one enclosed between two denser ones; these layers are penetrated by pit channels, which are seen in the further wall in transverse section. B^ a similar cell, more thickened. The pits are here long cana's, which are more or less branctied. X about 550.— After Sachs. Kg. 14.—Brown-walled cells in the stem of Pleris aquilina. A, a half cell iso- lated and rendered roloi less by Schulze's maceration. S, a piece more strongly magniflad(x 550). Th"flasnre-lil£e pits are crossed, , theflssnre is twisted as the thickening increases ; j7, a side view of a fissure appearing as a simple channel, since it shows the narrow diameter. C7, cross-secfion; a, boundary lamella; 6, c, inner lami Use.—After Sachs. cepting in small isolated spots. As the wall thickens around these spots, they become at first pits, and finally channels. 29.—In some cases the pits or channels are simple, straight, or slightly bent extensions of the central cell-cav- ity ; in others they may be branched, as shown in Pig 135,' in cross-section they may be round, as in Fig. , or elon-. 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 : H. Holt
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectbotany, bookyear1888
