粗齿桫椤 cu chi suo luo

Alsophila acaulis Makino; Cyathea hancockii Copeland; C. polyodonta Domin; Dryopteris hancockii (Copeland) Nakai; D. taitunensis Koidzumi; Gymnosphaera denticulata (Baker) Copeland; G. hancockii (Copeland) Ching ex L. K. Lin.

Rhizome prostrate or short and erect, not forming treelike trunks, bearing several fronds at apex. Fronds 2-pinnate-pinnatifid, up to 1.5 m; lowest pinnae usually reduced; stipe 30-90 cm, stipe and rachis brown to dark purple-brown, lustrous, scaly and hairy on adaxial surface; scales on rhizome and stipe base golden-yellow, concolorous, lustrous, linear, ca. 1.5 cm × 1.5 mm, base rounded, margin ciliate; lamina lanceolate, 35-50 cm; pinnae 12-16 pairs, alternate, ascending, with short stipe, oblong, middle pinnae 12-40 cm, basal pair abbreviated; pinnules 7-8 × 1.6-1.8 cm, sessile, apex acute, pinnatifid almost to costule, basal 1 or 2 pairs free; pinnule segments ascending, margin dentate; veinlets 5-7 pairs, simple or rarely forked, basal basiscopic ones arising directly from pinnule costule, costae and midveins of pinnules and segments abaxially with bullate scales, scales with prominent dark tip. Sori orbicular, medial between midvein and margin; paraphyses many, slightly longer than sporangia; indusia absent.

Valleys, margins of evergreen forests; 300-1500 m. Chongqing, Fujian, Guangdong, Guangxi, Guizhou, Hunan, Jiangxi, Sichuan, Taiwan, Yunnan, Zhejiang [Japan (including Ryukyu Islands)].