Flora of North America species comparison

compact to creeping, erect to horizontal, with few to many persistent petiole bases of unequal lengths;

scales often uniformly brown but at least some bicolored with dark central stripe and pale brown margins, narrowly lanceolate.

compact, erect to ascending, with few to many persistent petiole bases of unequal lengths;

scales mostly uniformly brown but at least some bicolored with dark central stripe and pale brown margins, narrowly lanceolate.

8–60 × 2.5–12 cm.

4–30 × 1.5–6 cm.

light brown or straw-colored when mature, occasionally darker at very base, not articulate above base, relatively brittle and easily shattered.

light brown or straw-colored when mature, occasionally darker at very base, not articulate above base, relatively brittle and easily shattered.

lanceolate to ovate, 2-pinnate to 2-pinnate-pinnatifid proximally, moderately glandular, rarely somewhat viscid;

many glandular hairs with thick stalks and distinctly bulbous tips;

rachis with glandular hairs and scattered, often hairlike scales.

linear to lanceolate, usually pinnate-pinnatifid proximally, glabrescent to sparsely glandular, never viscid;

glandular hairs with thin stalks and slightly expanded tips;

rachis with scattered glandular hairs and rare, hairlike scales.

ovate-deltate to elliptic, longer than wide, abruptly tapered to a rounded or broadly acute apex, occasionally attenuate;

largest pinnae with 5–14 pairs of pinnules;

abaxial and adaxial surfaces glandular, lacking nonglandular hairs or scales.

ovate-deltate to elliptic, longer than wide, abruptly tapered to a rounded or broadly acute apex;

largest pinnae with 3–7 pairs of closely spaced pinnules;

abaxial and adaxial surfaces glabrescent to sparsely glandular, lacking nonglandular hairs or scales.

of relatively broad, nonfilamentous segments, these multiseriate throughout, composed of ± isodiametric cells, entire or glandular along distal edge, concealed by or slightly surpassing mature sporangia.

of narrow, filamentous segments, these uniseriate for most of length, composed of ± isodiametric cells, usually surpassing mature sporangia.

averaging 35–47 µm.

averaging 44–52 µm. 2n = 152.

dentate, sometimes deeply lobed;

margins nonlustrous, thin, with occasional glands, lacking cilia or translucent projections.

dentate, often shallowly lobed;

margins nonlustrous, thin, with occasional glands, lacking cilia, with 1–2-celled translucent projections on teeth.

tips usually enlarged to form whitish hydathodes visible adaxially.

tips occasionally enlarged to form whitish hydathodes visible adaxially.