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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 24

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17600 21. contents. The vessels are imbedded in the mass of tissue of two kinds, (a) [underlined] Xylem [/underlined] or wood-fibres, which are irregular and have thick walls, and (b) [underlined] Xylem-parenchyma [/underlined], cells which retain protoplasmic contents, and the form of ordinary isodiametric parenchyma cells, the cell walls are cellulose, or are sometimes signified. Taking up next a longitudinal section of the young stem of the sun-
 
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