. Botany of the living plant. Botany; Plants. 56 BOTANY OF THE LIVING PLANT the strands, thus completing the cambial ring. The cambium then forms a complete cylinder. The parts within the strands are called fascicular, and those between them inter-fascicular cambium [ Fig. 25). In woody stems where the strands are closely grouped, this distinction is not so Fig. 34. Transverse section of a single vascular strand from the young stem of the Elm. «=endodermis. sc=sclerotic pericycle. st = sieve-tubes. cc = cambium. pitted vessels. £*=protoxylem. mr=medullary rays. P=pith. ( x
. Botany of the living plant. Botany; Plants. 56 BOTANY OF THE LIVING PLANT the strands, thus completing the cambial ring. The cambium then forms a complete cylinder. The parts within the strands are called fascicular, and those between them inter-fascicular cambium [ Fig. 25). In woody stems where the strands are closely grouped, this distinction is not so Fig. 34. Transverse section of a single vascular strand from the young stem of the Elm. «=endodermis. sc=sclerotic pericycle. st = sieve-tubes. cc = cambium. pitted vessels. £*=protoxylem. mr=medullary rays. P=pith. ( x 150.) The cambium is recognised by the repeated division of its thin- walled cells by tangential walls, so that radial rows of cells are pro- duced. As there is no limit to the repeated divisions, a great increase of the tissues may be the result. The clearest evidence of division is in the centre of each radial row, and it has been concluded from careful comparison of many such rows that in each of them there is an ultimate initial-cell, which retains its identity, giving off on the one side cells formative of wood, and on the other cells formative of bast. This has been styled SaniVs law of cambial division (Fig- 35).. 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 Bower, F. O. (Frederick Orpen), 1855-1948; Wardlaw, C. W. (Claude Wilson), 1901-. London, Macmillan and Co. , ltd.
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