Flora of North America species comparison

not proliferous.

not proliferous.

erect, unbranched;

scales black with lighter margins, linear-lanceolate, 3–6 × 0.4–0.8 mm, margins entire.

short-creeping to ascending, occasionally branched;

scales dark reddish to brown throughout, narrowly deltate, (2–)3–5 × 0.2–0.4 mm, margins entire or shallowly dentate.

monomorphic.

monomorphic.

reddish brown throughout, lustrous, 1–12(–20) cm, 1/3–1/10 length of blade;

indument of black filiform scales.

reddish or purplish brown throughout, lustrous, 1–10(–13) cm, 1/3–3/4 length of blade;

indument of brown, narrowly lanceolate scales at base, grading into hairs.

linear, 1-pinnate throughout, 5–25(–40) × 1–2.5(–3) cm, thick, glabrous;

base gradually tapered;

apex acute, not rooting.

narrowly oblong to lanceolate, pinnate-pinnatifid to 2-pinnate, 2–17(–20) × 1–6 cm, thin to moderately thick, sparsely pubescent;

base truncate or obtuse;

apex acute, not rooting.

in 10–40 pairs, oblong to quadrangular, somewhat asymmetric;

medial pinnae 4–15 × 2–5 mm;

base rounded to cuneate;

margins crenulate or ± entire;

apex obtuse.

in (3–)5–15(–25) pairs, ovate, obovate to lanceolate or deltate-lanceolate;

medial pinnae 6–40 × 3–10 mm;

base truncate to obliquely obtuse;

margins dentate to denticulate;

apex acute or rounded.

free, obscure.

free, barely evident.

1(–3) per pinna, only on basiscopic side.

3 to numerous pairs per pinna, on both basiscopic and acroscopic sides.

32 per sporangium.

64 per sporangium.

reddish brown throughout, lustrous, glabrous.

reddish or purplish brown proximally, fading to green in distal 1/3–2/3, lustrous, sparsely pubescent.

= 2n = 108 (apogamous).

= 144.