Houphan Prov., Viengxay Distr., Xieng Luong village, around point 20°22'06.1''N 104°17'18.6''E. Primary and secondary broad-leaved evergreen dry forest on very steep rocky slopes of highly eroded mountains composed by solid marble-like limestone at elev. 600-700 m a.s.l. Short creeping lithophytic fern in mossy crevices of shady vertical cliff on mountain top. Not common.
Record creation: 2026-03-02, Аверьянов Леонид ВладимировичCitation: Specimen LE 01203806 // Virtual herbarium of Komarov Botanical Institute RAS — http://re.herbariumle.ru/01203806