小叶中国蕨 xiao ye zhong guo jue

Cheilanthes albofusca Baker, Bull. Misc. Inform. Kew 1895: 54. 1895; C. mairei Brause; Sinopteris albofusca (Baker) Ching; S. hopeiensis C. Christensen & Ching.

Rhizomes erect, short; scales bicolorous, chestnut-black with narrow, brown margins, lanceolate. Fronds clustered. Stipe 4-12 cm. Lamina dull green adaxially when dry, as long as broad, 3.5-6 cm, tripartite, leathery, abaxially white farinose. Middle pinna somewhat rhombic, as long as wide, 3-5 cm, 2-pinnatifid, base cuneate and decurrent, usually connected with lateral pinnae by a narrow wing, rarely free, apex acuminate; pinnules 4 or 5 pairs, proximal pair largest, 2-3 × 0.4-0.8 cm, linear-lanceolate, apex obtuse or acute; ultimate segments 6-9 pairs, oblong or triangular, margins entire, apex obtuse or obtusely acute. Lateral pinnae triangular, 2-4 × 2-3 cm, inequilateral, 2-pinnatifid; proximal basiscopic segment especially enlarged, lanceolate or oblong, 1-2 × 0.3-0.6 cm, pinnatifid, apex shortly acuminate or acute, connected to costule by narrow wings. Veins free, prominently raised abaxially. Sori consisting of 1(or 2) large sporangium, sporangia with broad annulus. False indusia usually wide, continuous, margins irregularly undulate-crenulate.

● Rock crevices under trees and shrubs; 500-3200 m. Gansu (Wenxian), Guizhou, Hebei, S Hunan, Sichuan, Xizang, Yunnan.