. An introduction to the structure and reproduction of plants. Plant anatomy; Plants. XYLEM 83 from which it was cut off. The large nucleus can generally' be seen embedded in the dense cj'toplasm which completely fills the cell. The phloem-parenchj-ma cells (Fig. 13, p.) are readity distinguished h\ their shape from the other elements. The cells of the cambium (Fig. 38, Ca.) appear much elongated in the longitudinal section and have abruptl}^ pointed ends. In the transverse section of the u-ood one can recognise, as in the Sunflower, small protoxylem-elements towards the interior (Fig. 37,
. An introduction to the structure and reproduction of plants. Plant anatomy; Plants. XYLEM 83 from which it was cut off. The large nucleus can generally' be seen embedded in the dense cj'toplasm which completely fills the cell. The phloem-parenchj-ma cells (Fig. 13, p.) are readity distinguished h\ their shape from the other elements. The cells of the cambium (Fig. 38, Ca.) appear much elongated in the longitudinal section and have abruptl}^ pointed ends. In the transverse section of the u-ood one can recognise, as in the Sunflower, small protoxylem-elements towards the interior (Fig. 37, ), large metaxylem-vessels beyond [),. Fig. 38.—Longitudinal section through tlie stem of the Vegetable Marrow (Cucurbita). Ca., cambium; Coll., collenchj-ma; Ep., epidermis; , metaxylem ; Par., parenchymatous cortex; Ph.' and ;, outer and inner phloem ; \y., protoxjrlem ; Scl., sclerenchyma. and numerous intermingled wood-parench\TQa cells. Where two vessels are in contact, the middle lamella between the pitted thickening lavers of the common wall can be clearly made out. In longitudinal sections the broad metaxylem-vessels (Fig. 38, ) show reticulate thickenings which are in marked contrast to the spiral thickenings of the protoxylem-vessels [) ; the shght constrictions occurring at short intervals mark the limits of the cells from which the vessel was built up, and, in thick sections, the ring-like remnants of the original septa can often. 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 Fritsch, Felix Eugene, 1879-; Salisbury, E. J. (Edward James), Sir, b. 1886. London, G. Bell and sons ltd.
Size: 1964px × 1273px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, booksubjectpl, booksubjectplants
