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Longitudinal section (diagrammatic) of a young xylem strand; c, cambium; y, young trachea,; p, pitted trachea; s, spiral trachea; a, annular trachea; m, pith.


John Merle Coulter, C.R. Barnes and H.C. Cowles, A Textbook of Botany for Colleges and Universities (New York:American Book Company, 1910) 344


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