Flora of North America species comparison

long-creeping, 1.5–3 mm diam.

short-creeping, 3–5 mm diam.

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

somewhat dimorphic, evergreen, somewhat spaced, fertile leaves long-petioled, more erect, and with more contracted pinnae, to ca. 1.1 m. Petiole straw-colored, to 60 cm × 2–5 mm, at base sparsely set with brown, lanceolate, stellate-hairy scales.

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.

30–45(–55) × 15–25 cm, broadest at base, with apical pinna similar to lateral pinnae.

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.

6–8(–12) pairs, 7–15(–18) × 2–3 cm (fertile 1–2 cm), incised 1/2–3/4 of width;

segments 3–5 mm wide, rounded at apex;

veins 6–10 pairs, proximal pair from adjacent segments united at obtuse angle below sinus with excurrent vein ca. 0.5–1 mm to sinus.

round, medial;

indusia tan, often glandular;

sporangia glabrous.

round, medial to supramedial;

indusia lacking;

sporangia with numerous hairs 0.1 mm.

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.

abaxially of mostly needlelike hairs 0.1–0.3 mm on costae and veins, blade tissue glabrous on both sides.

= 128.

= 144.