Pharmaceutical botany - Lighthouse Survival Blog
Pharmaceutical botany - Lighthouse Survival Blog
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,