|Pteridophyte|| Literature for Asplenium adiantum-nigrum
|Aspleniaceae -- The Spleenwort Family||Bibliography|
Common name(s): spleenwort, `iwa`iwa
|Distribution||Native to Europe (where it is most common), Africa, Eurasia, Mexico (Chihuahua), the southwestern United States, Pacific islands, and Taiwan. It apparently originated in Europe, as a fertile hybrid (an allotetraploid) between Asplenium cuneifolium and A. oropteris.In the Hawaiian Islands, indigenous to Kaua`i, O`ahu, Moloka`i, Lana`i, Maui, Hawai`i.|
|Habitat||Dry lava and cinders and also in open woods and shrublands.|
||Terrestrial, small to medium-sized; rhizomes decumbent, tips thickly covered with old stipes.
||Fronds 8-40 x 5-12 cm, not proliferous; stipes clustered, shiny, lower stipes dark brown, distal rachises light green, colors remaining distinct and entirely separate over several cm, color of stipe gradually tapering to a point and ending in distal stipes or rachises; scales at bases linear, dark brown, shiny, with hair-like tips; blade 2- to 3-pinnate, elongate-triangular, deltate to ovate, occasionally ovate-lanceolate, pale green, subcoriaceous, lustrous, basal pinnae longest; pinnae 8-12 pairs, alternate, stalked, deltate to deltate-lanceolate; pinnules short-stalked, lanceolate, stalks more or less winged, margins lobed to finely dentate at segment tips; veins free, forked.
||Sori plentiful, medial, 3 mm or less long, often overlapping, older sori covering entire abaxial surface; indusia thin.
||Greek adiantos, unwetted, + Latin nigrum, black or dark, possibly referring to the dark stipe.