Flora of North America species comparison

often whitish pruinose, slender, to 6 mm diam., acrid-tasting;

scales weakly bicolored, lanceolate, contorted distally, base and margins light brown, sometimes with dark central stripe, margins denticulate.

not whitish pruinose, slender to stout, 5–15 mm diam., taste unknown;

scales brown, ovate-acuminate, symmetric, somewhat to strongly clathrate, margins somewhat lighter, entire.

to 40 cm.

to 90 cm.

slender, to 2 mm diam.

slender to stout, to 7 mm diam.

oblong to narrowly lanceolate, pinnatifid, usually widest near middle, occasionally at or near base, to 7 cm wide, somewhat leathery;

rachis sparsely scaly to glabrescent abaxially, glabrous adaxially;

scales lanceolate-ovate, usually more than 6 cells wide.

broadly ovate, 1-pinnate at base, widest at or near base, to 60 cm wide, papery to almost leathery;

rachis glabrous abaxially and adaxially.

oblong, less than 8 mm wide;

margins entire to crenulate;

apex rounded to broadly acute;

midrib glabrous adaxially.

(pinnae) linear to oblong, apex acuminate;

proximal segments stalked to nearly sessile, distal ones slightly narrowed but broadly adnate at base, less than 35 mm wide;

margins entire or slightly wavy;

apex acute;

midrib glabrous adaxially.

midway between margin and midrib to nearly marginal, less than 3 mm diam., circular when immature.

in 1–3 parallel rows on both sides of costa, 0.5–3 mm diam., circular when immature.

more than 52 µm, tuberculate, surface projections more than 3 µm tall.

less than 58 µm, verrucose, with surface projections less than 3 µm. 2n = 148.

free.

anastomosing with a regular series of 2–5 rows of areoles on both sides of costae.

present, usually less than 40 per sorus, heads covered with glandular hairs.

absent.

= 148.