Pteris pseudowulaiensis Y. S. Chao

Pteris pseudowulaiensis Y. S. Chao, Taiwania 66 (3): 314. 2021. Fig. 3 Type. Taiwan • New Taipei, Mt. Pataoerh, 600–700 m, 29 Apr 2016, Hsu 8437 (holotype TAIF [497137!]; isotype TAIF [497138!]). Distribution and ecology. This species, recently described from Taiwan, was initially reported from southern China and Taiwan (Chao et al. 2021). In Vietnam, P. pseudowulaiensis was discovered in relatively dry evergreen broadleaf forests at lowland areas of Cuc Phuong National Park. Specimens examined. Vietnam • Ninh Binh Province: Cuc Phuong National Park, Muong Khu trail, Y.-S. Chao 3509, 3515, 3517, 3531 (TAIF!, VNMN!). Note. This species belongs to the Pteris fauriei Hieron. complex, a taxonomically challenging group due to its reticulate evolution involving hybridization, polyploidization, and apomixis (Chao et al. 2022). In Vietnam, five species from this complex have been recorded, namely P. arisanensis Tagawa (Chao et al. 2022), P. kawabatae Sa. Kurata (Chao et al. 2021), P. latipinna Y. S. Chao & W. L. Chiou (Chen et al. 2020 b), P. oshimensis Hieron. (Liao et al. 2013), and P. pseudowulaiensis. Morphologically, P. pseudowulaiensis closely resembles P. oshimensis but differs by having broader pinnae, measuring 2–3.5 cm compared to less than 2 cm in P. oshimensis. According to Chao et al. (2022), P. pseudowulaiensis is an apogamous diploid originating from hybridization of P. wulaiensis C. M. Kuo (a species reported from Japan and Taiwan) and another unknown species.