4. Cheilanthes fragilis Hooker, Fil. Exot. t. 96. 1859.
脆叶碎米蕨 cui ye sui mi jue
Cheilosoria fragilis (Hooker) Ching & K. H. Shing.
Rhizomes erect; scales concolorous, grayish brown, subulate-lanceolate. Fronds clustered. Stipe chestnut-brown to nearly black, 5-6 cm, with dense glandular hairs and few lanceolate scales. Lamina green to dark green, narrowly lanceolate, 20-25 × 4-6 cm, 2-pinnate, herbaceous, thin when dry, sparsely with glandular hairs on both surfaces, slightly narrowed proximally, apex acuminate; rachis chestnut-black, sparsely pubescent and with glandular hairs on both surfaces. Pinnae 15-20 pairs, almost spreading; medial pinnae largest, 3-4 × ca. 1 cm, lanceolate, shortly stalked, slightly narrowed proximally, apex somewhat obtuse; basal pinnae equilateral, basiscopic pinnules not enlarged. Pinnules narrowly oblong, medial ones larger, to 7 × 3 mm, somewhat adnate to costa, margins irregularly crenate and somewhat ciliate, apex obtuse-rounded. Veins pinnate, lateral veins forked. Sori interrupted. False indusia well developed, discontinuous, reniform to nearly semicircular, margins fimbriate.
Limestone rocks; ca. 1000 m. S Yunnan (Mengla, Yiwu) [Malaysia, Myanmar].