Characters and its authentication value of stem epidermal cell of medicinal plant in Dendrobium Sw. and their adulterants Effects of rare-earth element addition on seedling growth of Dendrobium candidum Characters and its authentication value of stem epidermal cell of medicinal plant in Dendrobium Sw. and their adulterants STUDIES ON THE DOUBLE FERTILIZATION AND EMBRYOGENY IN DENDROBIUM CANDIDUM WALL. EX LINDL.