Flora of North America species comparison

not proliferous.

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, unbranched;

scales blackish throughout, linear to narrowly triangular, 0.9–1.3 × 0.1–0.4 mm, margins entire.

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.

brownish black, 0.5–3(–5) cm, 1/9–1/7 length of blade;

indument of blackish, linear-lanceolate 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.

narrowly lanceolate, 2–3-pinnate, (4–)10–20(–)30 × 1–3(–5) cm, thin, glabrous;

base tapered somewhat;

apex formed by gradual reduction, 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 (8–)12–16(–22) pairs, oblong;

medial pinnae 0.5–2.5 × 3–10 mm;

base cuneate;

apex obtuse.

free, evident.

free, evident, 1 per segment.

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

1 per segment.

64 per sporangium.

64 per sporangium.

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

blackish brown, dull, essentially glabrous.

of 1–5 segments;

segments oblanceolate, 2–3 × 1–2 mm, entire;

apex mostly round.

= 144.

= 144.