Plenasium
| Plenasium Temporal range: | |
|---|---|
| Plenasium vachellii (syn. Osmunda vachellii) in the Shing Mun Arboretum, Hong Kong | |
| Scientific classification | |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Division: | Polypodiophyta |
| Class: | Polypodiopsida |
| Order: | Osmundales |
| Family: | Osmundaceae |
| Genus: | Plenasium C.Presl |
| Type species | |
| Plenasium banksiifolium (Presl) Presl | |
| Species | |
| Synonyms | |
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Plenasium is a genus of ferns in the family Osmundaceae. It is recognized in the Pteridophyte Phylogeny Group classification of 2016 (PPG I), but kept within a more broadly circumscribed genus Osmunda by other sources. The genus is known from Early Cretaceous to present.