Houphan Prov., Hem Distr., Nacoc village, Puphadeng mountain, around point 20°09′52.6′'N 103°10′19.4′'E.
Primary and secondary broad-leaved evergreen open dry forest on very steep rocky mountain slopes composed by solid marble like highly eroded limestone at elev. 1000-1200 m a.s.l.
Creeping epiphyte on old mossy tree on mountain top. Flowers orange, lip dark brown-purple. Common.