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, unbranched;

scales black with brown margins, lanceolate, 2–5 × 0.6–1 mm, sparsely denticulate.

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.

dark to light brown throughout, dull, to 1 cm, 1/10–1/15 length of blade, indument of scales throughout.

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

base gradually tapered;

apex narrowly acute, not rooting.

narrowly elliptic to narrowly lanceolate, pinnatifid, 4–15 × 1.5–6 cm, thick, sparsely puberulent to glabrescent;

base gradually tapered;

apex obtuse, 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.

free, evident.

free, obscure.

2–4 pairs per pinna, on both basiscopic and acroscopic sides.

3–7 pairs per pinna, on both basiscopic and acroscopic sides of lobes.

64 per sporangium.

64 per sporangium.

reddish brown throughout, lustrous, glabrous or nearly so.

light brown to tan, dull-scaly;

scales brown, lanceolate.

= 72, 144.

= 72.