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, rarely branched;

scales black throughout, linear-lanceolate, 1–3.5 × 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.

black or purplish black throughout, lustrous, 1–2 cm, 1/5–1/10 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 to narrowly oblanceolate, 1-pinnate throughout, 5–15 × 1–2 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.

in 12–30 pairs, oblong to quadrangular;

medial pinnae 5–10 × 2–3 mm;

base with slight or prominent acroscopic auricle and often with basiscopic auricle;

margins usually shallowly crenulate, rarely ± entire;

apex acute to obtuse.

free, evident.

free, obscure.

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

1–5 pairs per pinna, on both basiscopic and acroscopic sides.

64 per sporangium.

32 per sporangium.

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

black or purplish black throughout, lustrous, glabrous or with a few scattered scales.

= 2n = 180 (apogamous).

= 144.