Flora of North America species comparison

short-creeping;

scales bronzy deep yellow, concolored, margins entire.

short-creeping;

scales bicolored, centers dark reddish brown, margins pale tan, erose-ciliate.

lax-arching (rarely pendent), closely spaced, 40–75 cm.

arching or sometimes pendent, closely spaced, 20–110 cm.

1–2 mm diam., glabrous, occasionally glaucous.

1–3 mm diam., glabrous, occasionally glaucous.

fan-shaped, pseudopedate, 1-pinnate distally, 15–30 × 15–35 cm, glabrous;

proximal pinnae 3–9-pinnate;

rachis straight, glabrous, occasionally glaucous.

trowel-shaped, pinnate, 12–60 × 12–60 cm, gradually reduced distally, glabrous;

proximal pinnae 3-pinnate;

rachis straight, glabrous, not glaucous.

oblong, ca. 3 times as long as broad;

basiscopic margin straight;

acroscopic margin lobed, lobes separated by narrow incisions 0–0.9(–1.1) mm wide;

apex obtuse, divided into shallow, rounded lobes separated by shallow sinuses 0.1–2(–3.7) mm deep, margins of lobes crenulate or crenate-denticulate.

fan-shaped or rhombic, about as long as broad;

base cuneate;

apex rounded or acute, lobed, lobes separated by narrow incisions 0.5 mm wide.

transversely oblong, 1–3 mm, glabrous.

transversely oblong to crescent-shaped, 0.5–2 mm, glabrous.

mostly 34–40 µm diam. 2n = 58.

mostly 40–58 µm diam. 2n = 60.

stalks 0.5–1.5(–1.7) mm, dark color entering into segment base.

stalks 1–5 mm, with dark color ending abruptly at segment base, terminating in cupulelike swelling at base of segment (unlike any other species of Adiantum in the flora).