薄壁细胞向内生长的泡状物通过纹孔伸入相邻的管胞或导管形成的结构。
Tylose a bladder like ingrowth from a parenchyma cell into an adjacent tracheid or vessel through a paired pit.
次生木质部由孔纹导管、薄壁组织及射线所组成。
Secondary xylem consists of pitted vessels, parenchyma fibers and rays.
物理性能：单散孔，含树胶沉积物，侵填体丰富，导管与射线间纹孔小，轴向薄壁组织为傍管型，主为聚翼状，带状也常见。
Physical properties: a single scattering holes, including gum sediments, tylosis rich, catheter and ray pits between small, axial parenchyma as paratracheal type, main poly of, ribbon is also common.
导管分子很短，单穿孔，无穿孔的输水分子具单纹孔；
Tracheal element is very short, sheet is perforative, have odd grain opening without perforative element is defeated by water;
结果茵陈蒿具有梯纹、网纹和孔纹3种类型的导管，穿孔板类型为单穿孔。
Results There were 3 types of vessel elements, scalariform vessel, reticulated vessel and pitted vessel, the perforation plates were simple perforation plate.
结果茵陈蒿具有梯纹、网纹和孔纹3种类型的导管，穿孔板类型为单穿孔。
Results There were 3 types of vessel elements, scalariform vessel, reticulated vessel and pitted vessel, the perforation plates were simple perforation plate.
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