Flora of North America species comparison

to 5 pairs, strongly ascending, well separated, distance between 1st and 2d pinnae not or slightly more than between 2d and 3d pairs, basal pinna pair approximately equal in size and cutting to adjacent pair, obliquely narrowly cuneate, undivided to tip, margins sharply denticulate and often shallowly incised, apex rounded, venation like ribs of fan, midrib absent.

to 10 pairs, horizontal to slightly spreading, approximate to remote, distance between 1st and 2d pinnae not or slightly more than between 2d and 3d pairs, basal pinna pair approximately equal in size and cutting to adjacent pair, occasionally basal pinnae and/or some distal pinnae elongate, lobed to tip, nearly circular, fan-shaped or ovate, sides somewhat concave, margins nearly entire, shallowly crenate, occasionally pinnately lobed or divided, apex rounded, venation like ribs of fan with short midrib.

stalk 3–10 mm, 1/6 length of trophophore rachis;

blade yellow-green, oblong to oblong-lanceolate, 1-pinnate, to 6 × 1.5 cm, thin but firm.

stalk 0–2 cm, 0 to 1/5 length of trophophore rachis;

blade dull green, oblong to linear, 1-pinnate, to 10/2.5 cm, firm to herbaceous.

2-pinnate at base of sporangial cluster, 1.3–2 times length of trophophore.

1-pinnate, 2-pinnate in very large, robust plants, 1.5–2.5 times length of trophophore.

=180.

=180.