柳叶剑蕨 liu ye jian jue

Gymnogramma salicifolia Makino, Phan. Pter. Jap. Icon. t. 34. 1899; Loxogramme biformis Tagawa; L. fauriei Copeland.

Rhizome long creeping, ca. 2 mm in diam., rather densely scaly; scales brown or reddish brown, ovate-lanceolate, margin entire, apex acuminate. Fronds distant, subdimorphic or obviously dimorphic, 15-35 cm; stipe greenish yellow to paler, 2-5(-10) cm, or frond subsessile; lamina narrowly oblanceolate to linear, 15-20(-32) × 1-1.5(-3) cm, relatively thinly textured, fleshy, base decurrent to form wings along upper part of stipe, apex acuminate; costa raised abaxially, flat adaxially; veins hidden, areoles without or with few included veinlets. Sori on upper portion of fronds, up to 10 or more pairs, 1-3 cm, very oblique to subparallel to costa, medial between costa and frond margin, slightly sunken into lamina, paraphyses absent. Spores ellipsoid-monolete.

Epilithic on moss-covered rocks or epiphytic on tree trunks in forests; 200-1800 m. Anhui, Chongqing, Gansu, Guangdong, Guangxi, Guizhou, Henan, Hubei, Hunan, Jiangxi, Sichuan, Taiwan, Zhejiang [Japan, Korea, ?Vietnam].

Loxogramme salicifolia is almost sympatric with the following species, L. duclouxii, but it is not found in Yunnan and differs by the greenish yellow or paler stipe (not glossy purplish dark brown or black) and the sori medial between costa and margin (not close to the costa). Loxogramme salicifolia is a low-elevation species not found on the high plateau of Yunnan and Xizang. The report by Christensen (Contr. U.S. Natl. Herb. 26: 324. 1931) from Yunnan should be L. cuspidata; and the recent report by Chen (Fl. Yunnan. 21: 428. 2005) from Yunnan might be confused with L. duclouxii or L. cuspidata.