Flora of North America species comparison

scales weakly bicolored, margins brown, narrow, poorly defined, thin, sparsely ciliate-denticulate.

scales strongly bicolored, margins brown, broad and well defined, thin, erose to denticulate.

7–30 cm.

4–20 cm.

black to dark brown, much shorter than blade, grooved or flattened adaxially, bearing scattered glands and a few scales near base.

light brown, equal to or somewhat shorter than blade, grooved or flattened adaxially, bearing scattered glands and a few scales near base.

linear-lanceolate, 2-pinnate-pinnatifid, 3–6 times longer than wide, abaxially with conspicuous white or pale yellow farina, scales absent, adaxially glabrous at maturity;

basal pinnae usually slightly smaller than adjacent pair, ± equilateral, proximal basiscopic pinnules not greatly enlarged.

narrowly deltate, 2–3-pinnate, 2–4 times longer than wide, abaxially with conspicuous whitish farina, scales absent, adaxially glandular;

basal pinnae slightly larger than adjacent pair, ± equilateral, proximal basiscopic pinnules not greatly enlarged.

sessile, broadly adnate to costae;

segment margins slightly recurved, rarely concealing sporangia.

sessile or subsessile, narrowly adnate to costae or free;

segment margins strongly revolute, often concealing sporangia.

containing 64 spores.

containing 64 spores.

= 60.

= 60.