Occurrence of a Warty Layer in Vascular Cells of Plants

  title={Occurrence of a Warty Layer in Vascular Cells of Plants},
  author={Walter Liese and Myron C. Ledbetter},
ELECTRON microscopic observations have revealed that mature tracheids of conifers are lined on the inside with a warty layer. It consists of more or less spherical particles of an average diameter of 0.1–0.3µ, which are often covered by an amorphous layer. The appearance and properties of the warty layer vary according to species1–5. It develops during the last stages of cell differentiation and consists of the remnants of the protoplast. Consequently the existence of a warty layer should not… CONTINUE READING