Home
Plants 12-17 cm tall. Rhizomes erect or ascending, scaly; scales concolorous, brown, broadly lanceolate, ca. 4 mm, membranous, margin entire. Fronds clustered; stipe castaneous, lustrous, 3-7 cm, ca. 1 mm in diam., with long hairs and linear-lanceolate scales, articulate below middle; lamina 1-pinnate-pinnatifid, lanceolate, 8-11 × 1.3-2 cm, herbaceous, covered with articulate hairs, especially abaxially, base gradually attenuate, apex acuminate; rachis and costae with brown, linear scales and long articulate hairs; pinnae 10-20 pairs, sessile, well separated, oblique; middle pinnae largest, ovate-lanceolate, 8-11 × 4-8 mm, pinnatifid, with 3-5 pairs of lobes, apex acute; pinna lobes elliptic, basal pair largest, 2-4 mm, entire or irregularly undulate. Veins pinnate, veinlets not reaching laminar margin. Sori orbicular and attached at ends of veinlets, submarginal; indusia saucer-shaped, membranous, margin long ciliate. 2n = 78(82).
Rhizome-scales abundant, brown, concolorous, lanceolate, 4-6 × 0.7-1 mm, attenuate, denticulate, sparsely fimbriate-ciliate; lvs 5-22 cm; petiole shining brown, articulate below the middle, scaly and hirsute; blade oblong-lanceolate, 2-3.5 cm wide, slightly narrowed below, pinnate-pinnatifid, the rachis hairy and scaly; pinnae 10-16 pairs, firm, narrowly oblong, sessile, dark green, deeply pinnatifid, the (2-)4-7 pairs of segments oblong, rounded, sparingly long-ciliate, the larger ones irregularly lobed, the costae with pale, linear scales and long septate hairs; indusium a minute disk with a marginal fringe of long hairs; 2n=82. Rock-crevices, mostly on acid substrate; circumboreal, s. to B.C., Sask., nw. Io., n. Ill., O., Pa., and in the mts. to N.C. W. ×abbeae Butters is a sterile diploid hybrid with W. oregana.
