Casparian strip was frequently regarded as a specific structure of tracheophyta, which appeared as a lignified and suberized narrow zone encircling the radial and transverse walls of the endodermal cells.

• 凯氏带(Casparian strip or Casaprian band)是维管植物根内皮层的一种特有结构，其主要特征是在内皮层细胞的初生壁上，围绕细胞径向壁和横向壁的木质和栓质的带状结构。