蜘蛛岩蕨 zhi zhu yan jue

Gymnogramma andersonii Beddome, Ferns Brit. India 1: t. 190. 1866.

Plants 10-20 cm tall. Rhizomes short, erect or ascending, scaly; scales dark brown, linear-lanceolate, ca. 3 mm, membranous, margin entire. Fronds clustered; stipe stramineous or brownish stramineous, lustrous, 5-10 cm, ca. 1 mm in diam., continuous, with fibrous small scales and articulate hairs, later partly fallen; rachis sparsely hairy when old, stipes and rachises persistent after pinnae fallen; lamina basally 2-pinnatifid, apically pinnatifid, lanceolate, 5-10 × 1-2 cm herbaceous, both surfaces densely covered with rusty, articulate long hairs, especially when young, base not or slightly shortened, apex acuminate; pinnae 6-9 pairs, sessile, lower pairs well separated, not or slightly shortened; middle pinnae ovate or subrhombic, 7-12 mm, base broadly cuneate, margin lobed, apex obtuse; ultimate segments 2-4 pairs, hemielliptic, entire or undulate. Veins obscure, pinnate, veinlets not reaching laminar margin. Sori orbicular, located on acroscopic veinlets, 1-3 per segment, medial or supramedial; indusia consisting of 8-10 long, curly hairs. 2n = 328.

Rock crevices and cliffs in forests; 2500-4500 m. Gansu, Qinghai, Shaanxi, Sichuan, Taiwan, Xizang, Yunnan [Bhutan, N India, Nepal].

Woodsia andersonii is distributed in SW China and Himalaya. According to Knapp (Ferns Fern Allies Taiwan, 229, 483. 2011), it has been found in two locations in Taiwan. It is densely covered with rusty, long hairs when young, while most of the hairs fall away later.