小黑桫椤 xiao hei suo luo

Alsophila formosana Baker; A. lamprocaulis (Christ) Ching; A. metteniana var. subglabra Ching & Q. Xia; Aspidium lamprocaulon Christ; Cyathea formosana (Baker) Copeland; C. lamprocaulis (Christ) Ching; C. metteniana (Hance) C. Christensen & Tardieu; Dryopteris lamprocaulis (Christ) C. Christensen; Gymnosphaera formosana (Baker) Copeland; G. lamprocaulis (Christ) Ching ex L. K. Lin; G. metteniana (Hance) Tagawa; G. metteniana var. subglabra (Ching & Q. Xia) Y. K. Yang & J. K. Wu.

Rhizome not forming erect trunk, ascending to creeping or erect, up to 30 cm tall or more, bearing several fronds at apex. Fronds 2-pinnate-pinnatifid, 1-2.5 m; stipe dark brown, lustrous, up to 1.2 m, base scaly; scales on rhizome and stipe base brown, lustrous, lanceolate with caudate apex, up to 2 cm × 1.5 mm near base, margin paler and fimbriate; lamina 2-pinnate-pinnatifid, oblong-lanceolate, ca. 1.5 × 1 m, narrower near base, acuminate at apex; rachis reddish brown, glabrous with small pale brownish scales; middle pinnae ca. 40 cm; pinnules 6-9 × 1.6-2.2 cm, deeply pinnatifid to 2-4 mm to costule, basal segment not free; pinnule segments narrow, apex crenate; veinlets 5 or 6 pairs, simple, basal basiscopic ones arising directly from pinnule costule; costae reddish brown, subglabrous, with some small scales; scales gray, narrow, apex with a long black stiff hair; costules scaly at base; scales dark brown, with paler margin, apex curled, with a stiff hair, with some smaller, gray, basally bullate scales, apex also with a stiff hair. Sori medial; paraphyses many, longer than or as long as sporangia; indusia absent.

Wet forests, forest margins, hillsides. Chongqing, Fujian, Guangdong, Guizhou, Sichuan, Taiwan, Zhejiang [Japan (including Ryukyu Islands)].