《植物细胞与组织》课程教学资源（PPT讲稿）厚壁组织图

石细胞 lumen primary cell wall and middle lamella secondary cell all impregnated with lignin pit canal

石细胞

纤维 fibers Figure 4.5 Fibers. A. A cross section of a portion of stem tissue from a linden tree (Tilia sp ) x1, 000. Note the thickness of the walls of the darker fibers. B. A longitudinal section through fibers in a Welwitschia leaf, x1, 000 (B Photomicrograph by G S Ellmore)

纤维