Vientiane prov., Kasi distr., between Pa Chao and Nam Ken villages, Pa Chao Mt., around point 19°19′50.6′'N 102°21′20.5′'E. Secondary broad-leaved evergreen dry forest on very steep rocky mountain slopes composed by solid marble like highly eroded limestone at elev. 1000-1100 m a.s.l. Epiphyte on mossy trees on shady steep rocky slope. Occasional.
Fl. in cult. 1 Oct. 2018. Flowers with strong sweet, rather unpleasant smell; sepals and petals pale yellow with many small brown-purple spots; lip white with yellow center; column purple; anther white with yellow tint. Photos L. Averyanov.