The Histology of the Cell Wall With Special Reference to the Mode of ..., Part 1
The Histology of the Cell Wall With Special Reference to the Mode of ..., Part 1
Sir Arthur William Hill
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HILL ON THE communication with the ring of resin canals at the inner edge of the secondary wood, the cells of which canals show a large numl^er of threads arranged in the usual manner. The Phloem, — The phloem of Pimts sj/lvestris, which is figured in the various works of Strasburger,'* is made up of sieve tubes and of cambiform or bast-parenchyma cells. The albuminous cells, which usually accompany the medullary rays, may also be conveniently described with the phloem. A study of the distribut...ion of the connecting threads in the phloem and in the medullary-ray cells associated with it, brings out the striking fact that the sieve tubes never communicate directly, either with the cells of the bast-parenchyma, or with the starch-containing cells of the medullary ray, and that the following rela- tions exist, namely, that the sieve tubes are connected with the albuminous cells and the bast-parenchyma with the starch cells of the medullary ray. Both these latter are, however, connected with the albuminous cells, the starch cells freely and the bast-parenchyma to a much less degree, and from this it follows that the albuminous cells perform the important function of affording the only means of communication, and this an indirect one, between the sieve tubes and the rest of the parenchy- matous tissues which compose the bast and medullary rays.
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