Flora of North America species comparison

not proliferous.

not proliferous.

short-creeping, unbranched;

scales black with lighter margins, linear-lanceolate, 1.5–3 × 0.1–0.4 mm, margins entire.

short-creeping to ascending, occasionally branched;

scales dark reddish to brown throughout, narrowly deltate, (2–)3–5 × 0.2–0.4 mm, margins entire or shallowly dentate.

monomorphic.

monomorphic.

purplish black, lustrous, 0.5–3 cm, 1/3–1/20 length of blade;

indument of black filiform scales at base.

reddish or purplish brown throughout, lustrous, 1–10(–13) cm, 1/3–3/4 length of blade;

indument of brown, narrowly lanceolate scales at base, grading into hairs.

linear, 1-pinnate throughout, 7–17.5 × 0.9–1.8 cm, thick, glabrous;

base gradually reduced;

apex gradually reduced to whiplike rooting tip.

narrowly oblong to lanceolate, pinnate-pinnatifid to 2-pinnate, 2–17(–20) × 1–6 cm, thin to moderately thick, sparsely pubescent;

base truncate or obtuse;

apex acute, not rooting.

in (12–)20–40 pairs, oblong;

medial pinnae 6–9 × 3–4 mm;

base broadly cuneate or auriculate;

margins crenate-serrate;

apex obtuse.

in (3–)5–15(–25) pairs, ovate, obovate to lanceolate or deltate-lanceolate;

medial pinnae 6–40 × 3–10 mm;

base truncate to obliquely obtuse;

margins dentate to denticulate;

apex acute or rounded.

free, obscure.

free, barely evident.

3–7 pairs per pinna, on both basiscopic and acroscopic sides.

3 to numerous pairs per pinna, on both basiscopic and acroscopic sides.

64 per sporangium.

64 per sporangium.

purplish black throughout, lustrous, glabrous or nearly so.

reddish or purplish brown proximally, fading to green in distal 1/3–2/3, lustrous, sparsely pubescent.

= 144.