华北岩蕨 hua bei yan jue

Woodsia gracillima C. Christensen; W. tsurugisanensis Makino.

Plants 3-10 cm tall. Rhizomes short, erect, scaly; scales concolorous, brown, ovate-lanceolate or elliptic, membranous. Fronds clustered; stipe stramineous, 1-2 cm, brittle, articulate below middle; lamina 1-pinnate-pinnatifid, lanceolate, 2-8 cm × 3-12 mm, thinly herbaceous, both surfaces glabrous, base attenuate, apex acuminate; pinnae 7-14 pairs, sessile, spreading or slightly oblique; lower pinnae shorter than above, remote from each other; middle pinnae largest, subrhombic or obliquely ovate, 4-8 × 3-5 mm, base broadly cuneate or truncate, margin pinnatifid, with 2 or 3 pairs of segments, apex acuminate or acute; pinna segments obovate or tongue-shaped; basal pair largest, ca. 2 mm, undulate or with 1 or 2 crenations at tip. Veins pinnate, not reaching laminar margin. Sori orbicular, consisting of a few sporangia, located at veinlet tips or on veinlets, usually 1-3 per segment; indusia saucer-shaped, thinly membranous, margin with flexuose brown articulate long hairs.

Wet shaded rock crevices in forests; 1700-2200 m. Hebei, Heilongjiang, Jilin, Nei Mongol, Shaanxi, Shanxi [N India, Japan, Korea, Nepal, Russia].

Woodsia hancockii is similar to W. glabella in the slender and glabrescent fronds but differs from it in the more slender lamina, trapeziform pinnae, and much larger indusia fringed with long hairs.