Download Pharmaceutical Botany by Heber Wilkinson Youngken PDF

By Heber Wilkinson Youngken

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Microscopic examination shows this 6. region to be composed of soft, pale, growing cells ending in the triangular apex-cell of the root. From the free base of the apex cell segment cells are cut off as calyptrogen cells. These by dividing root cap. The root cap or calyptra consists of a mass of loosely attached cells which forms a protective covering around the tip of the root. form the From the inner sloping sides of the apex cell the segment cells give origin to the dermatogen^ which by repeated division of its cells, originates the epidermis (outer protective covering of the root) periblem, originating cortex and , the and the plerome originating the bundle related tissue.

Of the rhizome is called the anterior extremity and presence of an apical end is known as the posterior extremity and in the living plant constantly decaying, as the anterior portion elongates. is Histology of Mature Stem (Rhizome). Passing from periphery toward the center the following structures are to be observed : Epidermis, a protective outer covering tissue, composed of a single layer of brownish polyhedral cells from which are given off 1. scaly hairs. 2. Outer Cortex (hypodermis), a zone of several layers of thickwalled lignified cells separating the epidermis from the inner cortex beneath.

CHAPTER II THE MALE FERN [DRYOPTERIS OR NEPHRODIUM) FILIX-MAS] LIFE HISTORY OF (ASPIDIUM The Male Fern along with the Marginal Fern (Dryopteris marginhave long been known to the pharmaceutical and medical pro- alis) drug Aspidium, a most valuable remedy tapeworm. The parts of these plants employed are the rhizome and stipes which are collected in autumn, freed of the roots and dead portions and dried at a temperature not exceeding fessions as the source of the for the expulsion of 7 oC. HISTORY OF THE SPOROPHYTE OR ASEXUAL GENERATION of Stem.

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