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, rarely branched;

scales black with lighter margins, linear-lanceolate, 2–3 × 0.2–0.4 mm, margins entire, or denticulate distally.

monomorphic.

monomorphic.

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

indument of black filiform scales at base.

reddish brown or purplish black throughout, lustrous, 2–5 cm, 1/4–1/6 length of blade, sometimes curved like a J at base;

indument of blackish brown, filiform scales at base.

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

base gradually reduced;

apex gradually reduced to whiplike rooting tip.

linear, 1-pinnate throughout, 5–15(–28) × 1–2.5 cm, thick, glabrous;

base gradually tapered;

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.

15–30 pairs, oblong;

medial pinnae 5–10 × 2–3 mm;

base rounded to cuneate;

margins lobed or serrate;

apex obtuse.

free, obscure.

free, obscure.

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

2–6 pairs per pinna, on both basiscopic and acroscopic sides.

64 per sporangium.

64 per sporangium.

purplish black throughout, lustrous, glabrous or nearly so.

reddish brown or purplish black throughout, shiny, glabrous.