内卷剑蕨 nei juan jian jue

Grammitis involuta D. Don, Prodr. Fl. Nepal. 14. 1825; Gymnogramma involuta (D. Don) Hooker.

Rhizome short, ascending to creeping, ca. 1.5 mm in diam., densely scaly; scales grayish brown, ± triangular, up to 7 × 4 mm, thin, margin entire, apex acuminate; cells dense, as long as wide. Fronds in apical tuft, monomorphic; stipe indistinct, or very short and winged; lamina abaxially paler, adaxially deep green, lanceolate, up to 35 × 4 cm, base attenuate and decurrent into stipe, apex caudate-acuminate; costa ± raised abaxially, usually flat adaxially, straw-colored or pale green; veins all hidden, anastomosing with free included veinlets; lamina curled up when dry, texture thick and fleshy, glabrous on both surfaces. Sori linear, 3-4 cm, very oblique, well spaced, continuous from near costa to frond margin, superficial; paraphyses many, dense, longer than sporangia. Spores ellipsoid-monolete.

Epilithic on moss-covered rocks or epiphytic on tree trunks in evergreen broad-leaved forests; 2000-2500 m. S Xizang, W Yunnan [India, Nepal, N Thailand, Vietnam].