Stipes (3) 7–30 (40) cm. long, slender in juvenile, rather stout in older specimens, obtusely angular, striate, red-brown in the lower, green in the upper part, scattered-pilose or glabrous. Leaflets 6–26 x 6–25 mm., obdeltate, appressed-pilose at first, later glabrous or scattered-pilose towards the base; flanks shallowly concave or straight; outer margins rounded, irregularly crenate or crenate-dentate. Sporo-carps (2.4) 3–4 mm. long, (1.5) 2–3.25 mm. high, 1.5–2 mm. thick, obtusely rectangular in lateral view, dorsally usually concave to a varying degree, ventrally slightly convex, rectangular in dorsiventral cross-section (fully mature sporocarps sometimes almost bean-shaped), with a continuous shallow furrow from the dorsal side over the frontal side towards the ventral base, densely appressed-pilose when young, becoming gradually glabrous; lateral ribs hardly visible in mature specimens; raphe distinct, covering almost the entire base of the sporocarp; sori 6–8, inferior tooth absent or present as a very shallow hump; superior tooth present, rather short, subobtuse to acute. Pedicels 8 mm. long, terete, slender, wiry, erect or arching, 2 or 3 (or more), connate at the base, rarely solitary, pilose or rarely glabrous.
