. Botany of the living plant. Botany; Plants. 90 BOTANY OF THE LIVING PLANT divisions of cells just outside the tip of the cortex. The chief difference is that the piliferous layer is distinct in origin from the cortex, while in the Barley they were seen to have a common origin. A second type is illustrated by the Pea and other Leguminosae. (Fig. 64, B.) Here the stele, cortex, piliferous layer, and root-cap all originate from a common mass of meristem, which occupies the apex, and segregates gradually into the several tissues as the cells mature. Such facts show that no theory of " germi
. Botany of the living plant. Botany; Plants. 90 BOTANY OF THE LIVING PLANT divisions of cells just outside the tip of the cortex. The chief difference is that the piliferous layer is distinct in origin from the cortex, while in the Barley they were seen to have a common origin. A second type is illustrated by the Pea and other Leguminosae. (Fig. 64, B.) Here the stele, cortex, piliferous layer, and root-cap all originate from a common mass of meristem, which occupies the apex, and segregates gradually into the several tissues as the cells mature. Such facts show that no theory of " germinal layers " can have any general application in the development of the plant-body. The normal increase in number of roots is by the formation of lateral rootlets, which originate from deeply-seated tissues, and force their way b a bericu 'enl '°*. 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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