Class: Ophioglossidae (Adder's-Tongues, Grape Ferns, Moonworts, Whisk Ferns)
The taxonomy presented here follows the World Flora Online's WFO Plant List as at mid-August 2026.
Order: Ophioglossales [1 family; 4 genera; 137 species]
Family: Ophioglossaceae
| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
| Botrychium subbifoliatum | (Brack.) Lyon (1905) | Makou | 1917 or 1935 or 1940 | Hawai'i, Kauai, Lanai, Maui, Molokai & Oahu, Hawaiian Islands, USA | Uncertain [Missing or Extinct] | Access |
Order: Psilotales [1 family; 2 genera; 17 species]
Family: Psilotaceae
—No subordinate taxa
Statistics
| Conservation status | Number of taxa (in percentage) |
| Extinct | 0 |
| Missing | 0 |
| Extinct in the Wild | 0 |
| Possibly Extinct in the Wild | 0 |
| Globally Rediscovered | 0 |
| Rediscovered in the Wild | 0 |
| Reintroduced | 0 |
| Uncertain status | 1 (100%) |
| Hypothetical | 0 |
| Total | 1 (100%) |
| Erroneously listed | 0 |
| Invalid | 0 |
| Grand total | 1 (100%) |