2. Arachniodes quadripinnata (Hayata) Serizawa, J. Jap. Bot. 61: 53. 1986.
四回毛枝蕨 si hui mao zhi jue
Microlepia quadripinnata Hayata, J. Coll. Sci. Imp. Univ. Tokyo 30: 434. 1911; Dryopteris quadripinnata (Hayata) Hayata; Leptorumohra quadripinnata (Hayata) H. Itô; Rumohra quadripinnata (Hayata) Ching.
Rhizome long creeping, bearing brown ovate-lanceolate scales. Fronds 0.8-1 m; stipe purplish brown at base, upward gradually ochraceous or stramineous, 20-60 cm, 2-5 mm in diam., glabrescent or with a few scales similar to those on rhizome; lamina 4- or 5-pinnate, brownish green when dried, pentagonal-ovate, 29-48 × 27-40 cm, herbaceous, abruptly narrowed toward apex and acuminate, rachis glabrescent; pinnae ca. 10 pairs, alternate, obliquely spreading; lowest pinnae ovate-lanceolate, 16-28 × 8-16 cm, apex acuminate; primary pinnules 8-10 pairs, ovate-lanceolate, 5-13 × 2.5-6 cm (basal basiscopic one largest), apex acuminate; secondary pinnules ca. 12 pairs, shortly stalked, ovate-lanceolate, to 3.5 × 1.2 cm; tertiary pinnules 6 or 7 pairs, ovate-oblong, to 1 × 0.5 cm, basal acroscopic one largest, margin pinnatifid or coarsely serrate, or pinnatisect in 5-pinnate lamina; upper pinnae gradually reduced; axes and main veins adaxially with pale gray unicellular acicular hairs, veins abaxially with sparse linear-lanceolate or hairlike, flat-based scales. Sori small, 1-4 per ultimate segment, medial between main vein and margin; indusia brown, margin entire to acicular ciliate.
On rather damp ground in broad-leaved or coniferous forests, especially in shaded places by streams, also in wet thickets; 1600-2700(-3000) m. Anhui, Guangxi, Guizhou, Jiangxi, Sichuan, Taiwan, Yunnan [Japan].