Asplenium dielerectum, a member of the spleenwort family (Aspleniaceae), is a fern that grows in tufts of three to nine lance-shaped fronds, each 20 to 70 cm (8 to 28 in) long. The fronds emerge from a 1 to 2.5 cm (0.4 to 1 in) long rhizome covered with brown to dark gray scales. The frond stalks are reddish brown to black and smooth and glossy, 2 to 21 cm (0.8 to 8.3 in) long, and have a few stiff scales at the base. Each frond has 15 to 50 lance-shaped pinnae arranged oppositely along the midrib. The pinnae are between 2 and 4 cm (0.8 and 1.6 in) long and 4 to 8 mm (0.2 to 0.3 in) wide. Ten to 20 sori, which may be separate or fused, are borne on each margin of the pinna. Each sorus is covered by an indusium (protective membrane) that falls short of the edge of the frond and runs parallel to the edge of each pinna.