FLORA OF VIETNAM
Orchidaceae
Panisea tricallosa Rolfe

Son La Prov., Moc Chau Distr., Chieng Son comm., about 1 km to NE from Chieng Son Village, around point 20°46′02.0N 104°37′03.1E.

Remnants of primary broad-leaved evergreen forest on tops of hills composed with karstic highly eroded yellow-white limestone at elevation 1150-1250 m a.s.l.

Clustering epiphyte on mossy trees on mountain top. Common.

27 September 2016 CPC 8078
Coll.: L.Averyanov, N.T.Hiep, N.S.Khang, C.Q.Ngan, T.V.Maisak, N.T.Son.

Fl November – December 2016. Flowers entirely white, lip with 2 light yellow warts. 22 Nov. 2016. L. Averyanov