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, unbranched;

scales dark brown to black throughout, narrowly linear-deltate, 2–4 × 0.3–0.6 mm, margins entire.

monomorphic.

± dimorphic;

fertile leaves taller and more erect than sterile leaves.

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 throughout, lustrous, 1–10 cm, 1/4–1/3 length of blade;

indument of dark brown to 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.

lustrous, linear to narrowly oblanceolate, 1-pinnate throughout, 4–50 × 2–5(–7) cm, thin, glabrous, or occasionally sparsely pubescent;

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.

in 15–45 pairs, oblong to quadrangular;

medial pinnae 1–2.5 × 0.3–0.5 cm;

base with conspicuous acroscopic and sometimes basiscopic auricle, this overlapping rachis;

margins crenate to serrulate, sometimes more deeply incised in robust specimens;

apex acute to obtuse.

free, evident.

free, evident.

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

1–12 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 or purplish brown throughout, lustrous, glabrous.

= 144.

= 72.