Asplenium preussii Hieron.

Rhizome erect, c. 7 mm in diameter, set with dark brown, narrowly ovate-lanceolate, acuminate, entire rhizome-scales c. 4 mm long with narrow paler margins. Fronds tufted, herbaceous, gemmiferous; stipe greenish, subglabrous at maturity except for somewhat fimbriate scales of different sizes basally; lamina lanceolate to narrowly elliptic attenuate, c. 250 x 85 mm, base reduced but not gradually decrescent, pinnate to deeply 2-pinnatifid, basal acroscopic lobe of each pinna further divided; pinnae in c. 18 pairs, lanceolate, falcate, basal acroscopic lobe much-developed, other lobes oblanceolate to very narrowly obovate, 1-or 2-fid (occasionally up to 4-fid), each bearing a single sorus, upper surface glabrous, lower surface set with minute substellate and larger fimbriate scales. Sori c. 4 mm long; indusium membranous, sub-entire, c. 0.75 mm broad.

Terrestrial, especially on rocks, 3, 500 to 6, 000 ft. alt.