Abstract: Secretory cells of laticiferous canals contain many plastids and endoplasmic reticulum (ER) in Rhus verniciflua. The electron microscopy suggests that osmiophiiic Lacquer component is mainly synthesized in the plastids and ER. They may be eliminated from the protoplasts to the space between the plasmalemma and the cell wall in three ways: (1) by ER elements, (2) by vesicles approaching the plasmalemma and fusing their membrances with the latter, and (3) by their becoming surrounded by plasmalemma invaginations, and then they traverse the wall through the channels of plasmodesmata which became disconnected during the schizogenous development of the canals and percolate through the wall that faded into an even looser mesh of fibrillar material toward the canal lumen. More or less, nucleus, mitochondria, Golgi bodies and ground cytoplasm also take part in the above-mentioned process.

Key words: Rhus verniciflua, Laticiferous canal, Ultrastructure, Lacquer