Asplenium montanum Willd.

Roots proliferous. Stems horizontal, often arching upward, unbranched (although clusters of stems often form from root proliferations, giving false appearance of single much-branched stem); scales dark brown throughout, narrowly deltate, 2--4 × 0.2--0.4 mm, margins entire. Leaves monomorphic. Petiole dark brown to purplish black, lustrous proximally, fading to green distally, 2--11 cm, 1/2--1 1/2 length of blade; indument of blackish, narrowly lanceolate scales only at very base and of minute hairs. Blade deltate to lanceolate, 1--2-pinnate-pinnatifid, 2--11 × 1--7(--10) cm, thick, essentially glabrous; base truncate or obtuse; apex acuminate to acute, not rooting. Rachis green throughout, dull, sparsely pubescent. Pinnae in 4--10 pairs, deltate to lanceolate; proximal (longest) pinnae 6--35 × 4--20 mm; base obtuse to acute; margins coarsely incised; apex acute to rounded. Veins free, obscure. Sori 1--15 per pinna, on both basiscopic and acroscopic sides. Spores 64 per sporangium. 2 n = 72.