Son La Prov., Moc Chau Distr., Chieng Son comm., about 1 km to NE from Chieng Son Village, around point 20°46’02.0N 104°37’03.1E. Remnants of primary broad-leaved evergreen forest on tops of hills composed with karstic highly eroded yellow-white limestone at elevation 1150-1250 m a.s.l. Lithophytic and epiphytic fern on exposed mossy rocks. Very common.
Record creation: 2021-11-10, Leonid Averyanov, PhotoScan D2Citation: Specimen LE 01090921 // Virtual herbarium of Komarov Botanical Institute RAS — http://re.herbariumle.ru/01090921