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 mostly weakly bicolored, linear-subulate, 0.1–0.3 mm wide, centers dark brown, thin, margins lighter, thin, denticulate to entire.

monomorphic, widely scattered along stem, 12–50 cm;

croziers pubescent and bearing a few scales.

monomorphic, clustered on stem, 7–30 cm;

croziers nearly glabrous.

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

dark brown, lustrous, rounded 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, 1-pinnate, 1.5–4 cm wide;

rachis brown throughout, straight, rounded adaxially, 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.

broadly ovate to elliptic, 7–20 mm, leathery, glabrous;

margins plane, not recurved, not covering abaxial surface, borders whitish, entire;

apex obtuse to rounded.

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.

perpendicular to slightly ascending, usually not decurrent on rachis, simple and unlobed;

costae absent.

of ultimate segments obscure.

of ultimate segments obscure.

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

sessile or subsessile, containing 64 spores, intermixed with abundant farina-producing glands.

= 2n = 87, 116, apogamous.

= 58.