分生组织 meristem 薄壁组织 parenchyma tissue parenchyma collenchyma 机械组织 section sclerenchyma from stem mechanical tissue vessel in xylem 保护组织 companion cell sieve tube二 protective tissue vascular ·输导组织 cambium cells of conducting tissue ground tissue 分泌组织 epidermal secretory tissue cuticle Example of cellular arrangements and tissue organization in plant stems.•分生组织 meristem •薄壁组织 parenchyma tissue •机械组织 mechanical tissue •保护组织 protective tissue •输导组织 conducting tissue •分泌组织 secretory tissue