Taxonomic notes on some East Asian pteridophytes Author Wan, Xia 0000-0001-8312-6917 CAS Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization, Chengdu Institute of Biology, Chinese Academy of Sciences, P. O. Box 416, Chengdu, Sichuan 610041, China; & College of Life Sciences, Sichuan University, Chengdu 610065, China; & University of Chinese Academy of Sciences, Beijing 100049, China; & Missouri Botanical Garden, P. O. Box 299, St. Louis, Missouri 63166 - 0299, U. S. A. & xwan @ mobot. org; https: // orcid. org / 0000 - 0001 - 8312 - 6917 xwan@mobot.org Author Knapp, Ralf 0000-0002-0147-5687 Correspondent, The Muséum national d’Histoire naturelle (MNHN, Paris, France), Steigestrasse 78, 69412 Eberbach, Germany; & ralf. knapp @ gmail. org; https: // orcid. org / 0000 - 0002 - 0147 - 5687 ralf.knapp@gmail.org Author Chen, De-Kui 0000-0002-1224-7372 College of Life Sciences, Chongqing Normal University, Shapingba, Chongqing 401331, China; & No. 1 Middle School of Tongren, Tong Ren, Guizhou 554300, China & cjxby 739847 @ 163. com; https: // orcid. org / 0000 - 0002 - 1224 - 7372 Author He, Hai 0000-0001-9896-0971 College of Life Sciences, Chongqing Normal University, Shapingba, Chongqing 401331, China; & hehai @ cqnu. edu. cn; https: // orcid. org / 0000 - 0001 - 9896 - 0971 hehai@cqnu.edu.cn Author Zhang, Li-Bing 0000-0002-4905-040X CAS Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization, Chengdu Institute of Biology, Chinese Academy of Sciences, P. O. Box 416, Chengdu, Sichuan 610041, China; & Missouri Botanical Garden, P. O. Box 299, St. Louis, Missouri 63166 - 0299, U. S. A. & Libing. Zhang @ mobot. org; https: // orcid. org / 0000 - 0002 - 4905 - 040 X hang@mobot.org text Phytotaxa 2023 2023-05-12 597 2 128 140 http://dx.doi.org/10.11646/phytotaxa.597.2.3 journal article 10.11646/phytotaxa.597.2.3 1179-3163 7929279 Polystichum pseudodeltodon Tagawa (1937: 159) . Figure 3 . Type :— Taiwan Island : Taito (Taitung), inter Kiriyama et Tippon-zan , 4 Oct. 1934 , M . Tagawa 1069 ( KYO ) . Polystichum pseudodeltodon has long been identified as P. deltodon ( Baker 1880: 494 ) Diels (1899: 191) even in the recent works (e.g., Knapp 2011 , Hsu et al. 2019 ). However, P. deltodon does not occur in Taiwan but only in Central and southern China ( Zhang & Barrington 2013 ) and Japan ( Ebihara 2016 ). Polystichum pseudodeltodon has pinnae with rounded auricles and hardly toothed pinna margins, whereas P. deltodon has pinnae with acute auricles and toothed pinna margins ( Tagawa 1937 , Zhang & Barrington 2013 ). Polystichum pseudodeltodon is endemic to Taiwan ( Zhang & Barrington 2013 ). Morphologically it is quite variable ( Knapp 2011 ) and more studies are needed.