Phou Khao Khouay National Protected Area to about 40 km NE of Vientiane. Dry evergreen primary and secondary forest along rocky stream on sandstone at elev. 350 m a.s.l. Epiphyte on small gnarled trees along stream in shady place. Not common. 9 December 2015 L.Averyanov, T.Maisak. AL 158 ass.