Flora of North America species comparison

not proliferous.

proliferous.

short-creeping, unbranched;

scales black with lighter margins, linear-lanceolate, 1.5–3 × 0.1–0.4 mm, margins entire.

erect, unbranched;

scales blackish throughout, linear to narrowly triangular, 0.9–1.3 × 0.1–0.4 mm, margins entire.

monomorphic.

monomorphic.

purplish black, lustrous, 0.5–3 cm, 1/3–1/20 length of blade;

indument of black filiform scales at base.

brownish black, 0.5–3(–5) cm, 1/9–1/7 length of blade;

indument of blackish, linear-lanceolate scales at base.

linear, 1-pinnate throughout, 7–17.5 × 0.9–1.8 cm, thick, glabrous;

base gradually reduced;

apex gradually reduced to whiplike rooting tip.

narrowly lanceolate, 2–3-pinnate, (4–)10–20(–)30 × 1–3(–5) cm, thin, glabrous;

base tapered somewhat;

apex formed by gradual reduction, not rooting.

in (12–)20–40 pairs, oblong;

medial pinnae 6–9 × 3–4 mm;

base broadly cuneate or auriculate;

margins crenate-serrate;

apex obtuse.

in (8–)12–16(–22) pairs, oblong;

medial pinnae 0.5–2.5 × 3–10 mm;

base cuneate;

apex obtuse.

free, obscure.

free, evident, 1 per segment.

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

1 per segment.

64 per sporangium.

64 per sporangium.

purplish black throughout, lustrous, glabrous or nearly so.

blackish brown, dull, essentially glabrous.

of 1–5 segments;

segments oblanceolate, 2–3 × 1–2 mm, entire;

apex mostly round.

= 144.