18. Woodsia rosthorniana Diels in Engler, Bot. Jahrb. Syst. 29: 187. 1900.
密毛岩蕨 mi mao yan jue
Woodsia delavayi Christ; W. jeholensis Nakai & Kitagawa; W. lanosa Hooker var. attenuata C. Christensen.
Plants 7-25 cm tall. Rhizomes short, erect, scaly; scales brown, lustrous, linear-lanceolate, 4-5 mm, membranous, margin entire, apex subulate. Fronds clustered; stipe yellowish brown or stramineous, 2-6 cm, less than 1 mm in diam., densely covered with yellow-brown long multicellular hairs and linear scales, stipe and rachis usually curved and ± S-shaped; rachis as densely hairy and scaly as stipe; lamina basally 1-pinnate-pinnatifid, apically pinnatifid, lanceolate, 7-20 × 1.5-3 cm, herbaceous, both surfaces densely covered with brownish long articulate hairs, base gradually shortened, apex acute; pinnae 10-15 pairs, spreading, sessile, lower pairs reduced into auricles, well separated; middle pinnae largest, oblong-elliptic or ovate-lanceolate, 8-15 × 5-8 mm, base broadly cuneate, margin pinnatifid, apex obtuse or rounded; ultimate segments 4 or 5 pairs, hemielliptic, basal pair largest, entire. Veins obscure, pinnate, veinlets nearly reaching laminar margin. Sori orbicular, located at vein endings or on veinlets, submarginal, dispersed throughout abaxial surface of pinnae at maturity; indusia shallowly saucer-shaped, dissected into 3-5 platelike lobes at maturity, margin with curly, unicellular hairs. 2n = 164.
Rock crevices in forests and in thickets; 1000-3000 m. Hebei, Liaoning, Shaanxi, Sichuan, Xizang, Yunnan [Bhutan].
"Eriosoriopsis rosthorniana" (Ching & S. H. Wu, Fern Fam. Gen. China, 402. 1991) belongs here but was not validly published because a full and direct reference to the author and place of valid publication of the basionym was not provided (Melbourne Code, Art. 41.5).