The book Handbook of Practical Botany was written by author Strasburger, Eduard, 1844-1912 Here you can read free online of Handbook of Practical Botany book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Handbook of Practical Botany a good or bad book?
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As results from the foregoing relations, the root of Thuja possesses no epidermis, the outer surface of the root is composed of the, for the time being, outermost layer of the periblem. If such a layer is followed in the direction of the apex, we shall soon see it pass under another, which for a time pro- vides a surface. The outermost living layers of cells are protected at their surface by the collapsed walls (become brown) of the disorganized layers of cells. The roots of the Gymnosperms hav...e, in general, no root-hairs; we search for such in vain in Thuja occidental™. The adjoining figure, 70, gives, with low magnification, Digitized by Google 187 THE ROOT-APEX OF CONIFERS. the structure of a longitudinal section, and can facilitate our obtaining information about it. Naturally, the arrangement of the cells can only be indicated with such a low magnification. Pass- ing from the exterior towards the interior, we see, therefore, the brown, collapsed covering of cells (x) ; then the periblem (pr)> which can be traced over the apex of the root, and whose outer- most layers, therefore, form the root-cap ; lastly, the plerome (pi), the termination of which is not quite clear with low magnification.
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