. An introduction to the structure and reproduction of plants. Plant anatomy; Plants. RELATION OF STRUCTURE AXD FUNXTION 73 fibres are developed in relation to the phloem. When roots serve not only for anchoring, but also for the support of the plant, a modified structure may obtain. Thus, a cross-section of the prop-root of the Maize (Fig. 32) contrasts ^\^th one of an ordinary root of this plant in the presence of a special cortical ring of mechanical elements and the larger size of the central cylinder,. Fig. 31.—Transverse section of the outer part of one of the underground branches of the
. An introduction to the structure and reproduction of plants. Plant anatomy; Plants. RELATION OF STRUCTURE AXD FUNXTION 73 fibres are developed in relation to the phloem. When roots serve not only for anchoring, but also for the support of the plant, a modified structure may obtain. Thus, a cross-section of the prop-root of the Maize (Fig. 32) contrasts ^\^th one of an ordinary root of this plant in the presence of a special cortical ring of mechanical elements and the larger size of the central cylinder,. Fig. 31.—Transverse section of the outer part of one of the underground branches of the Bird's Nest Orchid (Neottia nidus-avis), showing the vascular strand (T'.S.), the cortex (C.) and the mycorrhizal zone (.1/.). so that the xylem also is more peripheral. In both these respects the mechanical construction of such a prop-root ap- proaches that of a stem (cf. p. 87). The aerial roots of many tropical epiphytes { Orchids) also exhibit a modification of structure in correspondence with their special method of absorption and their function as assimi- latory organs. The cortical cells frequently contain chlorophj-il,. 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: 1283px × 1946px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, booksubjectpl, booksubjectplants
