Flora of North America species comparison

not proliferous.

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, not branched;

scales blackish throughout, linear-deltate, sparse, 1–1.3 × 0.1–2.4 mm, margins entire.

monomorphic.

nearly 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.

green, becoming blackish in older leaves, 1–5(–12) cm, 1/8–1/3 length of blade;

indument of black, narrowly lanceolate scales.

deltate, 2–3-pinnate, 2.5–10 × 2–6.5 cm, thick, hairs dark, scattered, minute;

base truncate;

apex acute to acuminate, not rooting.

dull, linear, 2-pinnate, (4–)12–22 × 1–3.5 cm, papery, glabrous;

base slightly tapered;

apex narrowing gradually, 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 9–20 pairs, oblong, 0.5–2 × 0.4–1.3 cm;

apex blunt to truncate.

free, evident.

free, evident.

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

1–2 per segment, on both basiscopic and acroscopic sides.

64 per sporangium.

abortive.

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

mostly blackish, green distally and in juvenile leaves, shiny, sparsely scaly.

of 1–2 segments;

segments linear-oblong, 3–6 × 1–3 mm;

margins dentate;

apex notched, pointed, rounded, or blunt.

= 144.

= ca. 180.