Flora of North America species comparison

creeping for 2–5 cm, then ascending or suberect, 1.5–3 mm diam.

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

monomorphic, dying back in winter, tightly clustered, (25–)40–105 cm.

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

straw-colored, 3–20(–35) 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, 20–70 cm, proximal 4–10 pinna pairs gradually reduced (smallest 5–20 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.

3–10 × (0.6–)1–2 cm, deeply pinnatifid to within 1 mm of costa;

segments oblong to linear, oblique (sides slanted, not perpendicular to costa), 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, glabrous or short-ciliate, sometimes also with glands;

sporangia glabrous.

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

indusia lacking;

sporangia glabrous.

abaxially of sparsely set hairs 0.2–0.7 mm on rachises, costae, and sometimes veins, also of numerous orangish, sessile to usually short-stalked glands on blade tissue;

blades adaxially glabrous except along costae.

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

blades glabrous adaxially.

= 54.

= 144.