Flora of North America species comparison

creeping, horizontal, slender, 2–4 mm diam.;

scales mostly bicolored, narrowly lanceolate, largest scales 0.3–0.8 mm wide, centers black, thick, margins brown, thin, irregularly 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, widely scattered along stem, 12–50 cm;

croziers pubescent and bearing a few scales.

monomorphic, clustered on stem, 8–40 cm;

croziers sparsely villous.

straw-colored, tan, or gray, not lustrous, rounded or slightly flattened adaxially, without prominent articulation lines.

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

ovate to elongate-deltate, usually 2-pinnate proximally, 4–20 cm wide;

rachis tan throughout, straight to slightly flexuous, rounded or flattened adaxially, ± pubescent.

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

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

ovate to elliptic, 5–15 mm, leathery, glabrous or usually puberulent abaxially;

margins recurved on fertile segments, usually covering less than 1/2 abaxial surface, borders whitish, nearly entire;

apex obtuse to slightly 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, usually with 7–21 ultimate segments;

costae straight to slightly flexuous, 20–100 mm, longer than ultimate segments.

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.

short-stalked, containing 32 spores, not intermixed with farina-producing glands.

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

= 2n = 87, 116, apogamous.