Flora of North America species comparison

short-creeping, 4–6 mm diam.

short-creeping to suberect, 5–10 mm diam.

often somewhat dimorphic, evergreen, often closely placed, 50–150 cm, fertile leaves with longer petioles and more contracted pinnae.

monomorphic, dying back in winter, crowded, (15–)25–100 cm.

often purplish brown, 15–50 cm × 3–6 mm, at base with brown, linear-lanceolate, hairy scales.

straw-colored to tan above base, 3–20 cm × 2–5 mm, scales on petioles and rachises tan to straw-colored, persistent, ovate to lanceolate.

(25–)40–100 cm, 1–4(–6) proximal pairs of pinnae reduced, blade gradually tapered to pinnatifid apex.

elliptic, 25–80 cm, 5–10 pairs of proximal pinnae gradually smaller toward base, lowest pinnae ca. 1 cm, blade tapering gradually to pinnatifid apex.

7–17 × 1–3 cm, incised 1/2–3/4 of width;

segments rounded at apex, basal acroscopic segment of proximal pinnae often auriculate;

proximal pair of veins from adjacent segments united at obtuse angle below sinus with excurrent vein 2–4 mm.

deeply pinnatifid to ca. 1 mm or less from costa, 3–12 × 1–2 cm;

segments linear to oblong, somewhat oblique and often somewhat curved, entire or crenulate, basal segments of proximal pinnae more often crenulate;

proximal pair of veins from adjacent segments meeting margin above sinus.

round, medial to supramedial;

indusia tan, pubescent, hairs 0.1–0.3 mm;

sporangial stalks with orangish, stalked glands.

round, submarginal;

indusia tan, glabrous;

sporangia glabrous.

abaxially of uniformly short hairs 0.1–0.2 mm on costae, veins, and blade tissue;

veins adaxially with stouter hairs, also with hairs 0.1–0.2 mm on blade tissue.

abaxially of tan to whitish linear scales along costae, hairs lacking or sparse along costae, blade tissue lacking glands or sparsely glandular.

= 144.

= 68.