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. Creeping terrestrial herb on shady steep slope. Leaves nearly almost black with median whitish stripe. Not common. 26 October 2013 CPC 6323a Coll.: L.Averyanov, N.T.Hiep, N.S.Khang, L.M.Tuan, N.A.Trang, L.H.Dan Fl. in cult. In July 2016. Flowers odorless, sepals and petals light olive green flushed with brownish to apex, lip white, spur and column reddish-brown, ovary and floral bract dull reddish-brown. Photos. L.Averyanov