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The sun flower as a type of flowering plants by Anne B. Jewett, 1890

The Sun Flower as a Type of Flowering Plants by Anne B. Jewett, 1890, Page 39

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36. be considered simply as a luxuriant growth of the primordial epidermis (Dermatogen), situated at the apex in such a way that the part of the dermatogen which covers the apex of the root divides periodically by tangential walls. Thus the dermatogen splits at the apex into two layers of cells, the outermost of which developes into a (many-celled) cap - the [underlined] Root-cap [/underlined].
 
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