FLORA OF VIETNAM
Ophioglossaceae
Helminthostachys zeylanica

Son La Prov., Yen Chau Distr., Muong Lum Municipality, Na Hat village, around point 21°00′37″N 104°30′06″E.

Broad-leaved (and former coniferous forest with Calocedrus rupestris) evergreen forest on steep slopes and on tops of ridge composed with rocky crystalline solid marble-like highly eroded limestone at elev. 900 m a.s.l.

Terrestrial fern on short tall pasture among open secondary shrubs. Rare.

HAL 9559 05 Nov. 2006
Coll.: Nguyen Tien Hiep, L.Averyanov, Pham Van The.