5. Asplenium resiliens Kunze (little ebony
spleenwort, blackstem spleenwort) Pl. 2a,b; Map 5
Leaves 5–30 cm long, monomorphic. Petioles black their entire length, shiny,
the color extending to nearly the tip of the rachis. Leaf blades pinnately
compound, linear in outline. Pinnae mostly opposite to subopposite on the
rachis, 3–12 mm long, the median pinnae (5–)7–12 mm long, oblong to ovate, the
margins entire or shallowly toothed, mostly shallowly auriculate at the base of
the upper margin, the base truncate to wedge-shaped, not overlapping the
rachis. Veins not anastomosing. Spores 32 per sporangium. 2n=108
Scattered throughout the Ozark and Ozark Border Divisions, and locally north to
St. Louis and Jackson Counties (southern U.S. north to Utah and Pennsylvania,
south to South America; West Indies). Shaded crevices and ledges of dolomite
and limestone bluffs and boulders.
This species has not been reported to hybridize with any other species of Asplenium
present in Missouri, presumably because of its apogamous reproductive cycle.