FLORA OF VIETNAM Orchidaceae Dendrobium longicornu Lindl.
Nghe An Prov., Ky Son Distr., Na Ngoi Municipality, eastern slopes of Phu Xai Lai Leng Mountain.
Primary and secondary broad-leaved forest on steep mountain slopes composed of sandstone and gray shale at elevation 1300-2000 m a.s.l. around point 19°12′54″N 104°12′01″E.
Epiphyte on mossy tall trees on shady steep slope. Flowers white, lip apex pinkish-orange. Not common.