12. Loxogramme duclouxii Christ, Bull. Acad. Int. Géogr. Bot. 16: 140. 1907.
褐柄剑蕨 he bing jian jue
Loxogramme saziran Tagawa ex M. G. Price; Polypodium remotefrondigera Hayata; P. succulentum C. Christensen.
Rhizome long creeping, 1-1.6(-3) mm in diam., dark brown to black, sometimes smooth when scales fall; scales dark brown to black, distinctly clathrate, subulate or ovate-lanceolate, 1-1.8 × 0.5-0.7 mm, margin entire. Fronds subdimorphic, or sometimes obviously dimorphic, closely spaced or distant, stipe on obvious 1-2 mm phyllopodia; phyllopodia long; stipe up to 7 cm, glossy purplish dark brown or black when dry; base with scales ovate, 3-4 × 0.9-1.6 mm, apex acute; lamina abaxially paler, adaxially deep green, linear-oblanceolate, 10-35 × 1.5-2.5(-3.5) cm, leathery, thick and fleshy, glabrous, base decurrent onto stipe, margin involute when dry, apex acuminate or caudate; costa raised abaxially, slightly distinct and flattened adaxially; veins invisible, anastomosing to form elongate areoles usually with included veinlets. Sori confined to upper half of fronds, 10 or more pairs, 0.5-1.2 cm, usually close together, oblique, rather close to costa, ± sunken into lamina, paraphyses absent or few and short, shorter than sporangia. Spores ellipsoid-monolete.
Epilithic on moss-covered rocks or epiphytic in evergreen broad-leaved forests; 800-2500 m. Anhui, Chongqing, Gansu, Guangxi, Guizhou, Henan, Hubei, Hunan, Jiangxi, Shaanxi, Sichuan, Taiwan, Yunnan, Zhejiang [NE India, Japan, Korea, Thailand, N Vietnam].
Loxogramme duclouxii is similar to L. salicifolia but differs in the distinctive glossy black stipe and sori rather close to the costa.