Title: Text-book of botany, morphological and physiological
Identifier: ajp2576.0001.001.umich.edu
Year: 1882 (1880s)
Authors: Sachs, Julius, 1832-1897; Vines, Sydney Howard, 1849-1934. ed. and tr
Subjects: Botany
Publisher: Oxford, Clarendon press
Contributing Library: University of Michigan
Digitizing Sponsor: University of Michigan

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ROOT. 163 Roots occur only in those plants the tissue of which is traversed by fibro- vascular bundles, and they themselves therefore always contain fibro-vascular bundles ; but these latter differ from those of the stem and leaves in the first vessels being formed near the circumference of the bundle, while the later ones are always formed further inside, and hence centripetally in reference to the diameter of the root. The phloem-bundles lie in the intervals between the
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FIG. 122.—Longitudinal section through the apex of a root of maize ; a a outer and older layers of the root-cap; i i inner and" younger layers; japex ; fn gfi\\z plerome; m becomes the pith, g a vessel, /"xylem; xrthe cortex which is produced from the periblem at the apex; ee epidermis, continued into the dermatogen at the apex; vv thickened outer wall of the epidermis (cuticle); (the origin of the root-cap from the dermatogen is not evident here; the figure was drawn long before this discovery). primary vascular bundles at the circumference of the fibro-vascular cylinder (see Sects* 16, 18.) Although roots are commonly present in vascular plants, /. e. the higher Cryptogams and all Phanerogams, there occur even in these groups particular species from which they are entirely absent. Thus among Rhizocarpese the genus Salvinia% m 2

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