Flora of North America species comparison

short-creeping, 4–6 mm diam.

creeping to suberect, 2–3 mm diam.

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

somewhat dimorphic, evergreen, laxly arching or prostrate, sterile leaves often rooting at attenuate apices or along rachises, mostly (10–)15–55 cm, fertile leaves more erect and with longer petioles, not rooting, with more contracted pinnules.

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

green, 1–25 cm × 0.5–1 mm, at base sparsely set with brown, lanceolate, stellate-hairy scales.

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

usually 10–30 cm, pinnate in proximal half only or throughout, narrowed distally 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.

entire to crenate to shallowly lobed ca. 1/3 of width, 1–2.5(–5) × 0.3–1(–1.5) cm, sometimes subcordate at base;

proximal pairs from adjacent segments usually united with excurrent vein or veins free.

round, medial to supramedial;

indusia tan, pubescent, hairs 0.1–0.3 mm;

sporangial stalks with orangish, stalked glands.

round, medial to supramedial;

indusia minute or lacking;

sporangia with stellate hairs.

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 stellate, forked, and needlelike hairs on rachises, costae, veins, and blade tissue;

blade tissue adaxially also with stellate hairs.

= 144.

= 144.