Orchidaceae Tainia penangiana Hook.f. Laos, Khammoune prov., Boualapha distr., Vang Maner village, Palai mountain area, around point 17°30′13.6″N, 105°49′23.9″E, 520 m a.s.l.
Primary dry evergreen and semideciduous broad-leaved forest on very steep rocky slope near karstic hill top composed with solid, marble-like highly eroded limestone at 300-500 m a.s.l.
Terrestrial herb on shady rocky slope with bamboo. Not common.
8 May 2018, L. Averyanov, Khang Sinh Nguyen, T. Maisak, Littideth Xaiyavongsa, Siphanom Keovankham, AL 788.
Fl. 15 Feb. 2019, sepals & petals light yellowish-brown, lip white with fine purple marks. Photos. L. Averyanov.