Taeniophyllum aphyllum (MAKINO) MAKINO, one of the epiphytic orchids in Japan, was investigated morphologically. The mature root has dorsiventral structure and the under side adheres to the substrate with four-layered velamen. The cortex contains chloroplasts. The central cylinder is a typical root-form. The young plant has one leaf, which is triangular in cross-section, and the basal surface is adjacent to the substrate, while the other sides serve for assimilation. The epidermis is provided with stomata, which are similar in structure to those of the other orchid-plants. The epidermal cells and the vascular bundle of the leaf differ from those of the flower stalk or the root, but resemble those of the other orchids. The leaf has no hairs, and no velamen nor velamen-like tissue
