Flora of North America species comparison

not proliferous.

not proliferous.

short-creeping, often branched;

scales black throughout or with brown borders, lanceolate, 2–5 × 0.2–0.5 mm, margins entire to denticulate.

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.

reddish brown or blackish brown throughout, lustrous, 1–4(–7) cm, 1/6–1/4 length of blade;

indument absent or of black, linear-lanceolate or 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, 3–22 × 0.5–1.5 cm, thin, glabrous or sparsely pubescent;

base gradually tapered;

apex narrowly acute, not rooting.

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 15–35 pairs, oblong to oval;

medial pinnae 2.5–8 × 2.5–4 mm;

base broadly cuneate, with or without low, rounded acroscopic auricle;

margins shallowly crenate to serrate or ± entire;

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, evident.

free, barely evident.

2–4 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.

reddish brown throughout, lustrous, glabrous or nearly so.

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

= 72, 144.

= 144.