FLORA OF VIETNAM Orchidaceae Biermannia calcarata Aver. Vietnam, Quang Binh Prov., Quang Ninh Distr., Truong Son municipality, around Long Son village at 17º13’11’’N 106º26’58’’E. Secondary dry forest on the slope of highly eroded karst limestone hill composed with gray solid limestone above high vertical cliff along Long Dai River at elevation about 300 m a.s.l. Epiphyte along stream. Locally common. HAL 11485 11 April 2008 Coll.: L.Averyanov, P.K.Loc, N.T.Vinh, N.S.Khang