Laos, Khammouane prov., Boualapha distr., Nong Seng village, southern sandstone slopes at summit of Phou Chuang (Poujeuang) Mt. around point 17°35′00.3″N, 105°47′35.6″E. Primary evergreen mixed and coniferous dense wind-formed forest at elev. 1000-1400 m a.s.l. Clustering epiphyte and lithophyte on mountain top. Occasional. 4 May 2018, L. Averyanov, Khang Sinh Nguyen, T. Maisak, Littideth Xaiyavongsa, Siphanom Keovankham, AL 645. Flowered in 6 August 2019, L. Averyanov, AL 645.1, flowers dark emerald green. Photos.