Flora of North America species comparison

proliferous.

proliferous.

horizontal, often arching upward, unbranched (although clusters of stems often form from root proliferations, giving false appearance of single much-branched stem);

scales dark brown throughout, narrowly deltate, 2–4 × 0.2–0.4 mm, margins entire.

erect, unbranched;

scales brown throughout, linear-deltate, 1.2 × 0.1–0.3 mm, margins entire.

monomorphic.

monomorphic.

dark brown to purplish black, lustrous proximally, fading to green distally, 2–11 cm, 1/2–1 1/2 length of blade;

indument of blackish, narrowly lanceolate scales only at very base and of minute hairs.

green throughout, dull, 3–15(–20) cm, 1/3–2/3 length of blade;

indument absent.

deltate to lanceolate, 1–2-pinnate-pinnatifid, 2–11 × 1–7(–10) cm, thick, essentially glabrous;

base truncate or obtuse;

apex acuminate to acute, not rooting.

deltate, 1-pinnate, 7–12(–20) × 3–6(–9) cm, thick, papery, glabrous;

base not tapered;

apex attenuate, not rooting.

in 4–10 pairs, deltate to lanceolate;

proximal (longest) pinnae 6–35 × 4–20 mm;

base obtuse to acute;

margins coarsely incised;

apex acute to rounded.

in 4–8 pairs, linear-lanceolate;

medial pinnae 30–70 × 7–15 mm, slightly curved, strongly excavated in proximal basiscopic 1/3;

base with small acroscopic auricle;

margins entire to dentate;

apex attenuate.

free, obscure.

free, obscure.

1–15 per pinna, on both basiscopic and acroscopic sides.

2–9 pairs, medial, commonly 1–2 less on basiscopic side than on acroscopic side.

64 per sporangium.

64 per sporangium.

green throughout, dull, sparsely pubescent.

green throughout, dull, glabrous.

= 72.

= 72.