Flora of North America species comparison

not proliferous.

proliferous.

short-creeping or ascending, frequently branched;

scales dark reddish brown to blackish throughout, narrowly deltate, 2–4 × 0.2–0.4 mm, margins entire to undulate or with widely spaced shallow teeth.

erect, unbranched;

scales blackish throughout, narrowly deltate, 1 × 0.2 mm, margins entire.

monomorphic.

monomorphic.

reddish brown at base, green distally, lustrous, 1–5(–6) cm, 1/4–1/2(–1) times length of blade;

indument of dark reddish brown to black, narrowly deltate scales grading into glandular hairs.

brownish black, 3–10(–15) cm, 1/3–2/5 length of blade;

indument of blackish, narrowly lanceolate scales at base.

linear, 1-pinnate throughout, 2–13 × 0.6–1.2 cm, thin, glabrous or with sparse minute hairs;

base slightly tapering or truncate;

apex acute, not rooting.

oblong-lanceolate, 2-pinnate, 10–30 × (1.5–)5–10 cm, thin, glabrous;

base not or only slightly tapered;

apex gradually narrowing, not rooting.

in 6–21 pairs, deltate to rhombic;

medial pinnae 5–6 × 4–5 mm;

base obtuse and often inequilateral;

distal margins crenate;

apex rounded to acute.

in (7–)14–22 pairs, oblong;

medial pinnae 1–6 × 0.5–1.5 cm;

base truncate;

apex pointed.

free, evident.

free, evident.

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

1–4 per segment, usually more on acroscopic side.

64 per sporangium.

abortive.

green throughout, dull, glabrous or with scattered hairs as on petioles.

blackish to green, dull, nearly glabrous.

linear to fan-shaped to unequally pinnate, 3–9 × 1–7 mm, mostly notched apically.

= 72.

= 108.