Flora of North America species comparison

not proliferous.

not proliferous.

short-creeping, often branched;

scales black throughout or with brown borders, lanceolate, 2–5 × 0.2–0.5 mm, margins entire to denticulate.

erect or ascending, rarely branched;

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

monomorphic.

monomorphic.

reddish brown or blackish brown throughout, lustrous, 1–4(–7) cm, 1/6–1/4 length of blade;

indument absent or of black, linear-lanceolate or filiform scales at base.

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

indument of black filiform scales at base.

linear, 1-pinnate, 3–22 × 0.5–1.5 cm, thin, glabrous or sparsely pubescent;

base gradually tapered;

apex narrowly acute, 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 15–35 pairs, oblong to oval;

medial pinnae 2.5–8 × 2.5–4 mm;

base broadly cuneate, with or without low, rounded acroscopic auricle;

margins shallowly crenate to serrate or ± entire;

apex obtuse.

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.

2–4 pairs per pinna, 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.

reddish brown throughout, lustrous, glabrous or nearly so.

black throughout, lustrous, glabrous.

= 72, 144.

= 144, 216.