| 1 | Hairs on upper surface of rachis ctenitoid, shrivelled when dried or with obtuse apical cells |
| 1' | Hairs on upper surface of rachis persistently terete with acute apical cells |
| 2 | Sori exindusiate; scales less than 2 mm long |
| 2' | Sori indusiate; scales much longer |
| 3 | Frond wholly anadromous |
| 3' | Frond catadromous distally |
