Flora of North America species comparison

long-creeping, 1.5–3 mm diam.

monomorphic, dying back in winter, often 1 cm or more apart, fertile leaves often somewhat longer than sterile leaves, 25–80 cm.

straw-colored above base, 12–45 cm × 1–3 mm, at base sparsely set with tan, ovate, glabrous scales.

lanceolate, 14–35 cm, proximal pinnae largest, or lowest pair slightly smaller, blade tapered gradually to pinnatifid apex.

deeply pinnatifid to ca. 1 mm from costa, 3–10 × 1–2 cm;

segments oblong, somewhat oblique, entire;

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

round, medial;

indusia tan, often glandular;

sporangia glabrous.

abaxially of sparsely set hairs 0.2–0.4 mm primarily on costae, also of yellowish short-stalked glands less than 0.1 mm, blade tissue with numerous reddish to orangish, resinous, shiny, sessile, hemispheric glands;

blades adaxially with scattered hairs on veins.

from other subgenera by the combination of seasonal leaves, narrow, long-creeping stems 1–3 mm diam., pinnate-pinnatifid blades with generally greatly reduced proximal pinnae (except Thelypteris simulata), and veins meeting margin above the sinuses.

= 27, 32.

= 128.