N. Viet Nam. Ha Giang Province, Quang Ba District, Bat dai Son. Primary forest on limestone with Biota sp., Fraxinus, Quercus, Pseudotsuga, Acer and Taxus dominants along ridge and below peak at elev. 1100-1200 m (about 23°07′N 105°02′E). Lithophytic and epiphytic. Outer tepals tomentose outside, pale green inside, labellum light green outside, red-purple inside, rostellum light green. Occasional. DKH 5125 5 April 2000