FLORA OF VIETNAM Orchidaceae Dendrobium longicornu Lindl.
Vietnam, Ha Giang Prov., Yen Minh Distr, Lao Va Chai Municipality, vicinities of Chi Sang village around point 23°06′20″N, 105°04′25″E at elevation about 1450 m a.s.l.
Primary mossy coniferous forest with Tsuga sinensis on tops of high rocky ridge composed with highly eroded marble-like limestone.
Lithophytic and epiphytic herb along rocky mossy ridge edge. Flowers white, lip with orange center. Occasional.