Flora of North America species comparison

usually long-creeping, 3–6 mm diam.

monomorphic, evergreen, (0.5–)1–4 cm apart, (30–)55–135(–165) cm.

straw-colored, 15–80 cm × 2–6 mm, at base with tan to brownish, linear-lanceolate, hairy scales.

about equaling petiole length, broadest at base, gradually to somewhat abruptly tapered to pinnatifid apex.

(5–)10–25 × 0.8–2.2 cm, incised 4/5 of width;

segments oblique, somewhat curved, basal pair from middle pinnae often elongate parallel to rachis;

proximal pair of veins from adjacent segments reaching margin at or just above sinus.

round, supramedial to inframarginal;

indusia tan, hairy, hairs mostly 0.2–0.4 mm;

sporangia glabrous.

abaxially of hairs mostly 0.2–0.5 mm on costae, veins, and blade tissue, also sometimes of a few tan scales on costae and rachises;

blades adaxially glabrous except along rachises and costae.

from other subgenera by the combination of evergreen leaves, usually long- to short-creeping stems more than 5 mm diam., pinnate-pinnatifid blades with proximal pinnae usually not shortened (except Thelypteris hispidula and T. dentata), and some veins meeting margin at or below the sinuses.

= 36.

= 72.