. Botany for high schools and colleges. Botany. 163 BOTANT. 137, m, f, g), which is ensheathed by the Perillem,* which soon becomes transformed into the cortical portion of the <root {x, r, Fig. 137). The epidermis is developed from the Tegion from which the root-cap grows, and, in fact, as will be shown below, it is a continuation and modificaLion of the generating tissue of the root-cap. 210.—In Fig. 138 the relation of the parts is even better :shown than it .he previous figure. The central plerome -column is surrounded by a layer of active cells, the pericam-. fig. 138.—Median longitudi
. Botany for high schools and colleges. Botany. 163 BOTANT. 137, m, f, g), which is ensheathed by the Perillem,* which soon becomes transformed into the cortical portion of the <root {x, r, Fig. 137). The epidermis is developed from the Tegion from which the root-cap grows, and, in fact, as will be shown below, it is a continuation and modificaLion of the generating tissue of the root-cap. 210.—In Fig. 138 the relation of the parts is even better :shown than it .he previous figure. The central plerome -column is surrounded by a layer of active cells, the pericam-. fig. 138.—Median longitudinal section of the apex of tlie root of the huckwheat '{Fagopyrum eseulenfum), pc^ pericamhlum, constituting the boundary of the plerome column; e, dermatogen; between e andpc, periblem ; 7i, root-cap.—Alter De Bary. bium (pc); outside of the latter lies the periblem, or young cortical portion, and still outside of this the dermatogen (e), which further back on the root becomes the epidermis. The root-cap {h) lies entirely outside of, and is quite distinct from, the back portions of the dermatogen, but near the apex of the root there is a tract in which dermatogen and root-cap apparently fuse into one. At this point the layers * Anotber of Haustein's terms, from tlie Greek neplBWinm. a 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
Size: 1529px × 1635px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, booksubjectbotany, bookyear1888
