Flora of North America species comparison

not proliferous.

not 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.

short-creeping, mainly unbranched;

scales black or with narrow pale borders, narrowly lanceolate, 1.5–3 × 0.2–0.4 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.

dark reddish brown throughout, 1–4 mm;

indument of black linear 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.

linear, 1-pinnate, 2.5–14 × 0.5–1.2 cm, thick (open habitat) to herbaceous (shaded, moist habitat), essentially glabrous;

base somewhat tapered;

apex obtuse, 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 10–30 pairs, ovate to rhombic to ovate-oblong, 2.5–11 × 2–6 mm;

base truncate to shortly acute;

margins shallowly crenate (shade forms) to essentially entire (exposed forms);

apex obtuse, broadly rounded.

free, evident.

free, evident to obscure.

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

1–3 pairs per pinna on both basiscopic and acroscopic sides.

64 per sporangium.

64 per sporangium.

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

reddish brown in proximal 1/2–4/5, green distally, lustrous, glabrous.

= 72.

= 144.