Flora of North America species comparison

compact, ascending, stout, 5–10 mm diam.;

scales bicolored, linear-subulate, 0.1–0.3 mm wide, centers black, thick, margins brown, thin, erose-dentate.

compact, ascending, stout, 5–10 mm diam.;

scales bicolored, linear-subulate, 0.1–0.3 mm wide, centers dark brown to black, thick, margins brown, thin, dentate.

monomorphic, clustered on stem, 10–50 cm;

croziers sparsely to densely villous.

monomorphic, clustered on stem, 8–40 cm;

croziers sparsely villous.

black or dark purple, lustrous, rounded or slightly flattened adaxially, without prominent articulation lines.

dark brown, lustrous, flattened or slightly grooved adaxially, without prominent articulation lines.

linear to ovate, deeply pinnate-pinnatifid proximally, 2.5–8 cm wide;

rachis black or purple throughout, straight, often flattened adaxially, glabrous or villous.

linear-oblong, 2-pinnate proximally, 1–4 cm wide;

rachis brown throughout, straight, shallowly grooved adaxially, usually glabrous.

linear-oblong, 10–40 mm, leathery, glabrous to sparsely villous abaxially on midrib;

margins recurved on fertile segments, rarely covering more than 1/2 abaxial surface, borders whitish, entire;

apex mucronate.

linear, 5–20 mm, leathery, glabrous;

margins on fertile segments strongly revolute, covering more than 1/2 abaxial surface, borders greenish, crenate;

apex mucronate.

perpendicular to rachis or slightly ascending, not decurrent on rachis, ternate at base of leaf;

costae absent.

strongly ascending, not decurrent on rachis, usually with 5–11 ultimate segments;

costae straight, 5–20 mm, usually shorter than ultimate segments.

of ultimate segments obscure.

of ultimate segments obscure.

long-stalked, containing 64 spores, not intermixed with farina-producing glands.

short-stalked, containing 64 spores, intermixed with abundant farina-producing glands.