Polypodiaceae s.l. Aspleniaceae

Asplenium tenuifolium D. Don

Ha Giang prov., Quan Ba distr., Bat Dai Son Nature Reserve, Bat Dai Son commune, Pai Chu Phin village, around point 23º07ʹ54.9ʺN 104º59ʹ24.1ʺE, 1000-1220 m a.s.l., karstic, highly eroded mountains composed of solid marble-like limestone, primary evergreen broad-leaved and coniferous (with Pseudotsuga sinensis) humid forest on steep rocky slopes near mountain tops. Lithophyte on mossy rocks on rocky mountain top. Not common. 16 April 2018, L. Averyanov, Nguyen Sinh Khang, Chuong Quang Ngan, T. Maisak, VR 289 (HN, LE01058161 – photo).