皱叶蕗蕨 zhou ye lu jue

Mecodium corrugatum (Christ) Copeland; M. gongboense Ching.

Plants 8-10 cm tall. Rhizome brown, ca. 0.2 mm in diam., with sparse brown short hairs, with sparse hairy rootlets. Stipes remote, 1-1.5 cm apart, brown, filiform, 2-5 cm, subglabrous, narrowly winged at apex, wings decurrent. Rachis and costae winged throughout, wings sharply crisped. Lamina bipinnate to tripinnatifid, triangular-ovate, 4-6 × 2-2.5 cm, membranous, glabrous, base subcordate, apex obtuse; pinnae 8-10 pairs, closely spaced, alternate, subsessile, linear to lanceolate, 1.5-5 cm × 5-8 mm, base unequally cuneate, apex acuminate; pinnules 4-14 pairs, closely spaced, alternate, sessile, oblong to ovate, 4-6 × 3-4 mm, base decurrent, apex obtuse; ultimate segments simple or forked, narrowly linear, 0.5-0.8 mm wide, margin entire, sharply crisped, apex obtuse. Veins dichotomous, slightly raised on each surface, brown, glabrous, with a single veinlet. Sori on upper parts of frond, terminal on ultimate segments; involucres subcircular, oblong, or ovate, deeply cleft, entire or somewhat wavy at apex.

● On rocks or on tree trunks; 1800-2600 m. Hubei, Sichuan, Xizang.

The authors have not seen material of Hymenophyllum corrugatum var. elongatum Christ (Bull. Acad. Int. Géogr. Bot. 16: 101. 1906; Mecodium corrugatum (Christ) Copeland var. elongatum (Christ) H. S. Kung).