The annular and spirally thickened conducting elements generally deveiop in the protoxylem when the

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The annular and spirally thickened conducting elements generally deveiop in the protoxylem when the root or stem is

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Vessels or tracheae made up of a row of cells, placed one adove the other, with their intervening walls absent or variously pored. The walls of vessels are lignified and hard, but not. The thickeniong may be annular, spiral, scalariform, reticulate and pitted.

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