This peper deals with the structure and ultrastructure of the secretory ducts in the leaf of Angelicadahurica Deils. The secretory ducts in the leaf of Angelica dahrica Deils consist of a layer of epithelialcells encircling a round canal

and they distribute in the parenchyma tissues surrounding the vascularboundles and in the secondary phleom of large leaf veins. Those secretory ducts are schizogenous in ori-gin. The enlargement of the canals mainly depends on the surrounding intervening cells and anticlinaldivisions of the epithelial cells. The electron microscope observations suggest that Golgi bodies may beinvolved in dissolution of the middle lamella in the region of thg future canal cavities by secretion oflytic enzymes into the cell walls in development of the canals. Secretory cells in mature canals containmany plastids and endoplasmic reticulum

most of the plastids are sheathed by endoplasmic reticulum.The changes occuring in ultrastructure of the secretory cells in development of the canals are mainlydue to the changes of palstids

endoplasmic reticulum and osmiophilic droplets in quantity. They in-crease with the maturity of the canals

and decreasa with the senility of them. The osmiophilic sub-stances are produced mainly in plastids

periplastidal and cytoplasmic may be also participate in theprocess of synthesis and transportation of the secretions.