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contains water, minerals and support functions in the woody part, but does not have perforated tubular cells. is an elonged, wall-thickening, non-living cell. Sharp at both ends, long shuttle-shaped, small diameter, protosurs have disappeared when differentiation matures, leaving only woody thickened cell walls, often forming ring patterns, threads, trapezoids and pores and other types. Tube cell length between 0.1
mm to several centimeters, generally
1
to
2
cm. The overlapping tube cells are interspersed with each other at their skewed ends, and the aqueous solution can only communicate with each other through unenforced parts or diapers on its sidewall, and their infusion capacity is not as good as that of catheters, but the mechanical support capacity is stronger. Tube cells are found in the vast majority of ferns and naked plants and are the only conductive structures, and in most bee plants, tubes and catheters can be present in the woody part at the same time.
