(i) In many dicot plants, the lumen of the xylem vessels is blocked by many ballon-like ingrowths from the neighbouring parenchymatous cells. These balloon-like structures are called tyloses. (ii) Usually, these structures are formed in secondary xylem vessels that have lost their function i.e., in heart wood. in fully developed tyloses, starchy crystals, resins, gums oils, tannins or coloured substances are found.
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