纤维、纤维管胞和管胞,这三种细胞类型容易混淆,甚至在显微镜下也不易分辨。纤维是纺锤形两端尖锐的长细胞,比纤维管胞和管胞都长,它的次生并且木质化的壁,常比同一木材中的纤维管胞和管胞的壁都厚,成熟时则更厚,上面有少量倾斜缝隙状单纹孔。纤维在植物体内成束存在,起机械支持作用。纤维管胞是术质部两种纤维的主要类型(即韧型纤维和纤维管胞)之一,也是两端尖锐 Fibers, tracheids and tracheids, these three cell types are easily confused and are not easily discernible even under a microscope. Fibers are spindle-shaped long, long cells, both longer than both fibrocytes and tracheids, and its secondary and lignified walls are often thicker than those of the tracheid and tracheid in the same wood, and when mature Thicker, with a small amount of slanting slit-shaped holes on it. Fibers exist as bundles in the plant and serve as mechanical supports. Cytokeratin is one of the two main types of fibers in the tuberumatic section (that is, tough fiber and fiber tracheids) and also sharp