线叶蕗蕨 xian ye lu jue

Mecodium longissimum Ching & P. S. Chiu, Fl. Reipubl. Popularis Sin. 2: 350. 1959; M. lineatum Ching & P. S. Chiu.

Plants 10-30 cm tall. Rhizome dark brown, with sparse short multicellular hairs, with sparse rootlets. Stipes remote, 1-2 cm apart, brown, filiform, 2-10 cm, with brown multicellular hairs at base, glabrous upward, wingless, or only with decurrent wings at apex. Rachis and costae brown, glabrous, slightly zigzag, broadly winged throughout, wings flat, ca. 1 mm on each side. Lamina bipinnate to tripinnatifid, narrowly linear, 6-15 × 1-1.5 cm, membranous and semitransparent, glabrous; pinnae 10-16 pairs, closely spaced or slightly imbricate to neighboring ones, alternate, sessile, oblong-ovate, 6-10 × 4-5 mm, base decurrent, apex obtuse; ultimate segments simple or usually forked, closely spaced or imbricate to neighboring ones, flat, oblong, 1-3 × 1-1.2 mm, with a single veinlet, margin entire, apex obtuse or sometimes subtruncate. Veins dichotomous, brown, glabrous. Sori on upper parts of frond, 1 per pinna, apical on short acroscopic segments; involucres oval, ca. 1.5 mm, entire, deeply cleft to base and obtuse at apex.

● On wet rocks or on tree trunks in forests; 1800-3700 m. Hubei, Sichuan, Xizang, NW Yunnan.