| Histological observations on flower stalk internodes of Phalaenopsis cultured in vitro revealed that a Number of initial cells with large nuclei and dense protoplasm exist in the epidermis, cortex, and immature vascular bund les and that these divide or are capable of dividing in the early stage of the internodes. These cells begin to divide 7-11 days after the stalks are Placed in the culture medium and form protocorm- like bodies on the epidermis and the cut surface of the sections 20-45 days after the start of cell division. |