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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 18

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15. from the periphery to the centre are as follows: - I. A mass of Echlerenchyma. II. Soft Bast. ( these two together constitute the Phloem, or bark portion of the Bundle) III. The Cambium. IV The Xylem, or woody part of the structure. Examining [underlined] 1st [/underlined] The Echlerenchyma which is a half moon - shaped mass of tissue, the cells are thick-walled rounded cavities, some of them containing the remnants of protoplasmic
 
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