Flora of North America species comparison

usually long-creeping, 1.5–2.5 mm diam.

short- to long-creeping, 3–10 mm diam.

monomorphic, dying back in winter, mostly evenly spaced 1 cm or more (sun-gathering leaves in loose cluster), (25–)40–85 cm.

monomorphic to somewhat dimorphic, evergreen, fertile leaves with longer petioles, to 2 m or more.

straw-colored, 4–25 cm × 1–3 mm, at base with scales tan to reddish brown, ovate, glabrous.

tan, to ca. 1 m × 10 mm, at base with scales absent or ephemeral.

elliptic, 15–60 cm, proximal 4–10 pinna pairs gradually smaller toward base (smallest often less than 5 mm), blade tapering gradually to pinnatifid apex.

50–120 cm, with apical pinna similar to lateral pinnae and 1/2 to nearly equaling longest lateral pinna;

buds often present at base of proximal pinna.

deeply pinnatifid to within 1 mm of costa, 3–9(–13) × 1–2(–2.5) cm;

segments oblong to linear, somewhat oblique, entire to crenulate;

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

to 20 pairs or more, widest at or near rounded or broadly cuneate base, 20–30 × 2–6 cm, margin entire to crenulate;

main lateral veins of fertile pinnae 2–4 per cm, with 12–20 rows of areoles between costa and margin, secondary veins somewhat curved.

round, supramedial;

indusia tan, often ciliate;

sporangia glabrous.

oblong-arcuate, uniseriate between lateral veins on cross-veins;

indusia lacking;

sporangia glabrous.

abaxially of moderately to densely set hairs to 1 mm on rachises, costae, and veins, glands lacking or yellowish to light orangish, mostly sessile on blade tissue;

blades adaxially often with hairs on veins.

abaxially of mostly adpressed, curved hairs 0.2–0.3 mm on costae;

blades glabrous adaxially.

= 54.

= 144.