. Physiological botany; I. Outlines of the histology of phænogamous plants. II. Vegetable physiology. Plant physiology; Plant anatomy. ductions come, of course, the apparently unbroken rings of liber and the solid masses of wood in old roots. If this development of new wood and liber in a perennial dicotyledonous plant proceeds uninterruptedlj-, there will exist at the end of the first year secondary ele- • ments in large amount. After a period of rest, a perennial root re- sumes growth at the points where it was suspended, and the formation of new cork, cortex, liber, and wood goes on as befo
. Physiological botany; I. Outlines of the histology of phænogamous plants. II. Vegetable physiology. Plant physiology; Plant anatomy. ductions come, of course, the apparently unbroken rings of liber and the solid masses of wood in old roots. If this development of new wood and liber in a perennial dicotyledonous plant proceeds uninterruptedlj-, there will exist at the end of the first year secondary ele- • ments in large amount. After a period of rest, a perennial root re- sumes growth at the points where it was suspended, and the formation of new cork, cortex, liber, and wood goes on as before, until it receives further checks. Owing to conditions to be explained later, the charac- ter of the woody elements is not the same at the begin- ning and end of an active period ; hence there is gen- erally a clearly defined out- line bounding the product of growth of successive years. 347. More or less of the parenchyma of the original cylinder may remain in the form of radial lines or of bands (medullary rays), some of the same sort of tissue may be subsequently produced from now points of activity, and hence long and short radii will be met with. Fig. 94. Section tin-ougli the central cylinder of a binary root of a dicotyledon (Beta vulgaris): e, internal layer of the proper cortex; p, endodermis; m, peripheral layer of .the cylinder; l^ liber fascicles; v, woody fascicle; c, conjunctive parenchyma (pith and medullary rays.) (Van Tieghcm.) Fig. 95. Section Ihrougli the central cylinder of a binary root of a monocotyledon .(Allium Cepa): e,internal layer of the propercortex; jj, endodermis; m, periphei'al layer of the cylinder; 1, liber fascicles; v, woody fascicle; c, conjunctive parenchyma (pith and medullary rays). (Van Tieghem.). 95. 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 Goodale, Georg
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectplantanatomy, bookyea
