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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 30

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27. the inner tissue, which open in places externally between the Epidermis cells. The origin of the Stoma is always the result of the formation of a mother-cell, first of all by division of a young Epidermis-cell, which is sometimes preceded by several divisions in it or in the adjoining epidermis-cells; and this mother-cell becomes more and more rounded off, and the guard-cells of the stoma are
 
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