These cells are known as endodermal cells . 这些细胞称为内胚层细胞。
Other modifications include the uneven thickening of guard cells , the sieve plates in phloem , the suberization of endodermal cells , the waterproof coverings of epidermal and cork cells 此外还有其他的一些修饰形式,包括不均匀的加厚保卫细胞和韧皮部中的筛板,内皮细胞的栓化等。