石生蹄盖蕨 shi sheng ti gai jue

Rhizomes erect, apex densely clothed with red-brown, lanceolate scales. Fronds caespitose; fertile fronds 20-30 cm; stipe stramineous, 9-15 cm, ca. 1.5 mm in diam., base similarly scaly, upward glabrate; lamina pinnate-pinnatifid, lanceolate, 10-15 × 3.5-5 cm at middle, base slightly narrowed, apex acuminate; pinnae 13-15 pairs, lower pinnae opposite, upper pinnae alternate, spreading, sessile, basal pinnae shortened, 2-3 cm × 7-9 mm at base, base not narrowed or slightly broadened, pinnatipartite, apex shortly acuminate; pinna segments 6-8 pairs, basal segments opposite or subopposite, upper segments alternate, spreading or slightly ascending, approximate, oblong, middle segments ca. 3 × 1.5 mm, margin dentate, apex truncate or rounded with 3 or 4 teeth; veins inconspicuous on both surfaces, pinnate in segments, lateral veins 3 or 4 pairs, simple, sometimes forked on basal acroscopic segments. Lamina herbaceous when dried, brown-green, glabrate on both surfaces; rachis stramineous, glabrate abaxially, wing of costae with short hairs at margin; rachis and costae with short spines adaxially. Sori orbicular, 1 per segment, sometimes 2 or 3 in lower segments, on basal acroscopic veins; indusia brown, horseshoe-shaped, thickly membranous, entire, persistent. Perispore surface without folds.

● Rock crevices; ca. 3200 m. Sichuan (Emei Shan, Jinding).