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, 6–10 mm diam.;

scales uniformly orange-brown and thin, lanceolate to ovate, largest scales 0.3–1 mm wide, margins dentate.

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

croziers pubescent and bearing a few scales.

somewhat dimorphic, sterile leaves shorter than fertile leaves, clustered on stem, 15–50 cm;

croziers not conspicuously pubescent, densely scaly.

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

straw-colored, tan, or gray, not lustrous, rounded or slightly flattened 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.

ovate-deltate, 2-pinnate proximally, 5–20 cm wide;

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

round-cordate to deltate-cordate, 5–15 mm, herbaceous to leathery, glabrous or puberulent;

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

apex rounded or retuse.

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 rachis or slightly ascending, not decurrent on rachis, usually with 3–15 ultimate segments;

costae straight to slightly flexuous, 25–100 mm, longer than ultimate segments.

of ultimate segments obscure.

of ultimate segments usually evident.

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

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

= 2n = 87, 116, apogamous.

= 58.