Plants 13-15(-25) cm tall. Rhizome erect, short; scales brown to dark brown, narrowly triangular to lanceolate, margin with short teeth. Fronds caespitose; stipe short, less than 2 cm; lamina narrowly elliptical-obovate, 4-15 × 1.8-5 cm, gradually narrowed at base, pinnatipartite, apex acute to obtuse; segments 10-14 pairs, alternate, ovate to narrowly ovate, 8-12 × 5-8 mm, margin entire and hyaline, apex obtuse. Veins obscure, nothocatadromous (anadromous base pattern but several middle pinnae with their basal vein pair catadromous), lateral veins 6-8 pairs, often forking near margin. Fronds firmly papery, brownish yellow to dark brownish green when dry, glabrous, average guard cell length 45-54 µm. Sori 5-7 pairs per segment, 3-5 mm, oblique, on acroscopic secondary veinlets; indusia pale brown, linear, membranous, mostly opening toward costa. Spores pale brown, average exospore length 26-30 µm, outer perispore folded (lophate) and with small pores. Plants sexual diploid: 2n = 72.
Roots not proliferous. Stems erect, unbranched; scales black with brown margins, lanceolate, 2--5 × 0.6--1 mm, sparsely denticulate. Leaves monomorphic. Petiole dark to light brown throughout, dull, to 1 cm, 1/10--1/15 length of blade, indument of scales throughout. Blade narrowly elliptic to narrowly lanceolate, pinnatifid, 4--15 × 1.5--6 cm, thick, sparsely puberulent to glabrescent; base gradually tapered; apex obtuse, not rooting. Rachis light brown to tan, dull-scaly; scales brown, lanceolate. Veins free, obscure. Sori 3--7 pairs per pinna, on both basiscopic and acroscopic sides of lobes. Spores 64 per sporangium. 2 n = 72.
|Countess Dalhousie's spleenwort|