Based on the IUCN criteria, we proposed Phymatosorus longissimus (Bl.) Pic.Serm. to be a critically endangered species in Taiwan.We also discussed the taxonomy and the distribution of this species.

• 我们依循IUCN受威胁等级及准则，评估水社拟茀蕨在台湾的稀有等级为严重濒临灭绝。