Vietnam, Ha Giang Prov., Hoang Su Phi Distr., Ho Thau Municipality, around Trung Thanh village (22º37’24’’N, 104º38’00’’E) at elev. 900-1000 m a.s.l. Remnants of heavily logged primary and secondary closed evergreen broad-leaved forest on very steep slopes of mountains composed with shale and granite with quartzite. Epiphyte in shady narrow stream canyon. Occasional.