FLORA OF VIETNAM. Plants of Ngoc Son-Ngo Luong Nature Reserve. Orchidaceae. Biermannia calcarata Aver. Hoa Binh Prov., Lac Son Distr., Ngoc Son Municipality, Khu village, around point 20?27°42°° N, 105?18°34°° E, 611 m a.s.l. In heavily logged primary closed evergreen broad-leaved lowland forests on foot and slopes of limestone mountains. Rare. . Epiphyte. Flowers white. HAL 9039 28 Jul 2006 Photos. Collectors: Phan Ke Loc, Nguyen Sinh Khang & Nguyen Tien Vinh. Collected with the financial support from NYBG, U.S.A.