FLORA OF VIETNAM
Orchidaceae
Porpax grandiflora Seidenf.

Cao Bang Prov., Nguyen Binh Distr., Ca Thanh Municipality, Ta Pin village, around point 22°43′56.4″N, 105°51′16.4″E.

Primary coniferous forest with Pseudotsuga sinensis along highly eroded rocky limestone ridge at elevation about 1400 m a.s.l.

Clustering epiphyte on mossy trees in shady places along ridge. Not rare.

3 October 2013 CPC 5372 / TM 1031
L.Averyanov, N.T.Hiep, L.M.Tuan, N.S.Khang, T.Maisak, L.Osinovets

Flowers in cult. in 6-15 May 2015. Flowers dark reddish-brown, anther yellow. Photos.