Ceterach alternans Kuhn
Ceterach dalhousieae (Hook.) C.Chr.
Ceterachopsis dalhousieae (Hook.) Ching

Rhizome short, suberect to erect, up to 3 mm in diameter; rhizome scales narrowly triangular in outline, base heart-shaped, margin irregularly set with glands, up to 5 x 0.5 mm, dark brown, papery, latticed appearance. Fronds monomorphic, tufted, up to 14 cm long, coriaceous. Stipe up to 1 cm long, dark brown, without grooves, with scales similar to those on rhizome. Lamina pinnatisect, narrowly oblanceolate in outline, up to 14 x 2.8 cm; lobes alternate, oblong to cuneate in outline, apex rounded, base basiscopically somewhat short-decurrent along rhachis, acroscopically somewhat auriculate-adnate, margin entire to wavy, up to 15 x 5.5 mm, lower surface smooth, upper surface with sparse filiform scales mostly along veins; rhachis flattened abaxially, adaxially slightly raised and set with greyish-brown, thinly papery, narrowly triangular to filiform, marginal glandular scales, up to 5 x 0.4 mm; venation free, obscure, ending near margin. Sori linear, up to 3.5 mm long, up to 6 pairs per lobe, towards middle of lamina ; indusium papery, pale brown, linear, up to 0.5 mm wide, entire to wavy; also with a sorus on the acroscopic lobe auricle parallel or near parallel to rhachis, indusium of this sorus opening towards rhachis.

dalhousiae: named after countess Dalhousie, she discovered this fern in the Himalayas, India.

Temperate biome, in open forests and screes, on moist lava rocks.

Afghanistan, Arizona, East Himalaya,India, Mexico, Nepal, Pakistan, West Himalaya, Yemen.

Ethiopia.

Lithophytic, terrestrial.