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Pharmaceutical botany - Lighthouse Survival Blog

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PERENNIAL DICOTYL STEM 25<br />

Growth of Perennial Dicotyl Stem and its Histology.—A perennial<br />

dicotyl stem in the first year does not differ in structure from an annual.<br />

By the close of the year a cork cambium (phellogen) has originated be-<br />

Fig. 19.—Diagram similar to the preceding but representing a later stage and showing<br />

the tissues formed by the cambium. {From Stevens.)<br />

side the epidermis. In origin of cork cambium—one of two methods:<br />

(a) either the epidermis may divide into an outer layer of ceils that re-<br />

mains epidermis and an inner layer of cells that becomes cork cambium,

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