Plenasium vachellii

Plenasium vachellii is a fern in the family Osmundaceae. The genus "Plenasium" is recognized in the Pteridophyte Phylogeny Group classification of 2016 (PPG I); however, some sources place all "Plenasium" species in a more broadly defined "Osmunda", treating this species as Osmunda vachellii. It is native to south-central and southeast China (including Hainan) and Indochina (the Malayan peninsula, Myanmar, Thailand and Vietnam).