Hymenophyllum Sm.

Involucre bivalvate (deeply or to the base) or bivalvate in the upper portion but obconic at the base Hymenophyllum

Margin of the lamina and the axes not clothed with branched hairs

Lamina pinnately divided. Involucre and lamina without a black thickened margin

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Stipes and the lower part of the main rhachis not winged. Sori slightly immersed at the base. Fronds 2–3-pinnate-pinnatifid, 8–35 cm (rarely 4–8 cm) long including the stipes, 15–55 mm broad. Widespread. RF on tree ferns, rocks or trees, often in mountain gullies Hymenophyllum flabellatum

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Main rhachis winged; the wing usually continuous down the stipe