FLORA OF VIETNAM
Polypodiaceae s.l.
Polystichum deltatum Li Bing Zhang, M.Q. Han & Yan Liu

Ha Giang Prov., Quan Ba Distr., Can Ty Commune, Sin Suoi Ho Village, around point 23.09566°N 105.02142°E. Very steep mountain slopes composed of solid highly eroded karstic limestone at elevation 800–1000 m a.s.l. Remnants of primary evergreen broad-leaved and coniferous (with Calocedrus rupestris and Xanthocyparis vietnamensis) humid forest. Lithophytic fern on steep rocky slope. Very common. 11 October 2019, L. Averyanov, Nguyen Sinh Khang, T. Maisak, VR 1583 (HN, LE01067069, LE01070194).