FLORA OF LAOS Ophioglossaceae Botrychium virginianum (L.) Sw. s.l.
Vientiane Prov., Kasi Distr., Thong Mout village, around point 19°26′51.5”N 102°07′45.8”E.
Primary broad-leaved evergreen forest on very steep rocky slopes and on vertical cliffs of remnant highly eroded rocky limestone mountains composed by solid crystalline stratified limestone at elevation 1550-1650 m.
Terrestrial fern on shady slope along humid stream valley. Locally common.