N.Vietnam, Cao Bang Prov., Trung Khanh Distr., Ngoc Khe Municipality, Pac Nga village, around point 22º54'59''N, 106º31'44''E, at elevation 500-550 m a.s.l. Secondary shrubs on very steep mossy rocky slope of N exposition of rocky ridge composed with light gray solid marble-like highly eroded crystalline limestone along Quy Son River valley. Lithophytic fern on vertical mossy cliffs. Rare.
Record creation: 2026-02-25, Аверьянов Леонид ВладимировичCitation: Specimen LE 01203659 // Virtual herbarium of Komarov Botanical Institute RAS — http://re.herbariumle.ru/01203659