Vietnam, Lang Son Prov., Bac Son Distr., Tan Tri Municipality, around Na Mau village.
Highly degraded primary and secondary broad-leaved evergreen forest on very steep slopes and along tops of ridge composed with solid highly eroded crystalline gray marble-like limestone at elevation about 500-600 m a.s.l.
Lithophytic herb on vertical shady cliffs. Leaves green-brown with irregular whitish spots. Very common.
Record creation: 2021-11-09, Leonid Averyanov, PhotoScan D2Citation: Specimen LE 01077238 // Virtual herbarium of Komarov Botanical Institute RAS — http://re.herbariumle.ru/01077238