Flora of North America species comparison

dull or inconspicuously glaucous, moderately stout, to 10 mm diam., acrid or bland-tasting;

scales uniformly brown or slightly darker near point of attachment, lanceolate-ovate, symmetric, margins entire to erose.

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

scales weakly bicolored, lanceolate, contorted distally, bases and margins light brown, sometimes with dark central stripe, margins often coarsely dentate.

to 70 cm.

to 30 cm.

usually slender, to 3 mm diam.

slender, to 1.5 mm diam.

deltate to lanceolate-ovate, pinnatifid, usually widest near base, to 20 cm wide, leathery to herbaceous;

rachis sparsely scaly to glabrescent abaxially, puberulent adaxially;

scales deltate to ovate, usually more than 10 cells wide.

oblong to rarely deltate, pinnatifid, usually widest near middle, occasionally at or near base, to 4 cm wide, somewhat leathery;

rachis sparsely scaly to glabrescent abaxially, glabrous adaxially;

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

linear-lanceolate to oblong, usually less than 15 mm wide;

margins serrate;

apex widely obtuse to rarely attenuate;

midrib puberulent adaxially.

oblong, less than 12 mm wide;

margins entire to crenulate;

apex rounded to broadly acute;

midrib glabrous adaxially.

midway between margin and midrib or slightly closer to midrib, usually less than 3 mm diam., oval when immature.

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

less than 58 µm, verrucose, with surface projections to 3 µm. 2n = 74.

more than 58 µm, rugose to verrucose, surface projections less than 3 µm tall.

weakly to conspicuously anastomosing, most segments containing several areoles, often forming 1 row.

free.

absent.

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

= 74.