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.

erect or ascending, rarely branched;

scales black throughout, linear-lanceolate, 2–3 × 0.2–0.4 mm, margin entire, apex attenuate.

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.

black or purplish black throughout, lustrous, 0.3–5 cm, 1/4–1/15 length of blade;

indument of black 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 or narrowly oblanceolate, 1-pinnate throughout, 6–22(–37) × 1–1.8(–2.3) cm, thin, glabrous;

base 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.

in 15–40 pairs, oblong;

medial pinnae somewhat asymmetric, oblong, 4–10 × 2–4(–5) mm;

base acute, acroscopically enlarged;

margins serrate to crenate, lobed;

apex obtuse.

free, evident.

free, evident.

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

3–6 pairs per pinna, on both basiscopic and acroscopic sides of pinnae.

64 per sporangium.

64 per sporangium.

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

black throughout, lustrous, glabrous.

= 144.

= 144, 216.