Flora of North America species comparison

not proliferous.

short-creeping or ascending, frequently branched;

scales dark reddish brown to blackish throughout, narrowly deltate, 2–4 × 0.2–0.4 mm, margins entire to undulate or with widely spaced shallow teeth.

monomorphic.

reddish brown at base, green distally, lustrous, 1–5(–6) cm, 1/4–1/2(–1) times length of blade;

indument of dark reddish brown to black, narrowly deltate scales grading into glandular hairs.

linear, 1-pinnate throughout, 2–13 × 0.6–1.2 cm, thin, glabrous or with sparse minute hairs;

base slightly tapering or truncate;

apex acute, not rooting.

in 6–21 pairs, deltate to rhombic;

medial pinnae 5–6 × 4–5 mm;

base obtuse and often inequilateral;

distal margins crenate;

apex rounded to acute.

free, evident.

2–4 pairs per pinna, on both basiscopic and acroscopic sides.

64 per sporangium.

green throughout, dull, glabrous or with scattered hairs as on petioles.

= 72.