Flora of North America species comparison

not proliferous.

not proliferous.

ascending or short-creeping, infrequently branched;

scales dark brown to blackish throughout, narrowly deltate, 2–4(–5) × 0.2–0.5 mm, margins entire or shallowly denticulate to serrulate.

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.

dark reddish brown proximally, often fading to green distally, lustrous, 2–20 cm, 2/3–2 times length of blade;

indument of black filiform scales and minute hairs.

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.

deltate, 2–3-pinnate, 2.5–10 × 2–6.5 cm, thick, hairs dark, scattered, minute;

base truncate;

apex acute to acuminate, not rooting.

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

base gradually tapered;

apex acute, not rooting.

in 4–10 pairs, deltate to lanceolate;

most proximal (largest) pinnae 1.5–4 × 1–2.5 cm;

base obliquely obtuse;

segment margins coarsely incised;

apex acute.

15–30 pairs, oblong;

medial pinnae 5–10 × 2–3 mm;

base rounded to cuneate;

margins lobed or serrate;

apex obtuse.

free, evident.

free, obscure.

1–numerous pairs per pinna [1–6 pairs per segment], on both basiscopic and acroscopic sides.

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

64 per sporangium.

64 per sporangium.

greenish throughout or sometimes reddish brown proximally, lustrous, sparsely pubescent.

reddish brown or purplish black throughout, shiny, glabrous.

= 144.