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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 46

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43. The Fibro-Vascular System. The stems of the higher cryptograms and of Phanerogams are traversed by string-like masses of tissue, which in some cases develops by increase in thickness in such a manner that they lose externally the form of strings, and present that of strong masses. These retain however, always, some trace of all their successive differentiations internally, and are
 
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