| 1 | Megaspores smooth on inner surfaces. |
| 1' | Megaspores warted on inner surfaces. Stock 3-4-lobed. Leaves up to 7,5 cm |
| 2 | Leaves up to 50 cm. Stock 3-4-lobed. Microspores minutely scabrous |
| 2' | Leaves up to 14 cm. Stock 2-lobed. Microspores densely spinulose. |
