Studies of Vietnamese pteridophyte flora 4: topotype project. - Chen, Cheng-Wei; Rouhan, Germinal; Dang, Viet Dai; Luu, Hong Truong; Do, Van Truong; Lu, Thi Ngan; Chao, Yi-Shan; Huang, Yao-Moan; Chung, Kuo-Fang (PhytoKeys, 2026)