白边粉背蕨 bai bian fen bei jue

Cheilanthes albomarginata C. B. Clarke, Trans. Linn. Soc. London, Bot. 1: 456. 1880; C. farinosa (Forsskål) Kaulfuss var. albomarginata (C. B. Clarke) Beddome.

Rhizomes erect, short; scales bicolorous, black with broad, pale margins, lanceolate. Fronds clustered. Stipe dark brown, lustrous, 6-12 cm × 1-2 mm, scaly; scales black or dark brown, with conspicuous lighter margins, broadly lanceolate. Lamina oblong-deltoid to deltoid, 9-19 × 4-10 cm, pinnate-bipinnatifid at base, papery when dry, with white or pale yellow farina abaxially, also with scales along costae and midveins abaxially, glabrous adaxially; pinnae 3-5 pairs, sessile, distinct along rachis, basal pair of pinnae ovate-deltoid, inequilateral, bipinnatifid; pinnules 6-8 pairs, basal basiscopic pinnules larger than adjacent acroscopic ones, 2-3 cm × 0.5-1 mm, lanceolate, pinnatifid; second pair of pinnae with same shape as basal ones; third and upper pairs of pinnae lanceolate, pinnatifid. Sori consisting of several sporangia, confluent at maturity. False indusia broad, often nearly to midvein, interrupted, margins fimbriate. 2n = 58, 60, 116.

Rock crevices on slopes; 1300-2700 m. Guangxi, Guizhou, Sichuan, S Xizang, Yunnan [Bhutan, India, Kashmir, Nepal, Pakistan].