Flora of North America species comparison

lacking root hairs, unbranched or with a few narrow lateral branches, in 1 species dichotomously branched.

simple, unbranched, upright, with eustelic vascular tissue.

bases dilated, clasping, forming sheath, open or fused, surrounding successive leaf primordia;

primordia glabrous or with long, uniseriate hairs.

to 5 pairs, ascending, approximate, distance between 1st and 2d pinnae not or slightly more than between 2d and 3d pairs, linear to broadly lanceolate, entire to divided to tip, margins with distinct lobes or segments, apex acute to rounded, venation pinnate.

exposed or embedded, 0.5–1.5 mm diam., thick-walled, with thousands of spores.

all 1 kind, trilete, thick-walled, surface rugate, tuberculate, baculate (with projecting rods usually higher than wide), sometimes joined in delicate network, mostly with ± warty surface.

not green, usually fleshy, round or linear, subterranean, mycorrhizal.

stalk 0–1 mm;

blade dull to shiny green to dark green, deltate, 1–2-pinnate, to 6 × 7 cm.

blades compound to simple, rarely absent, veins anastomosing or free, pinnate, or arranged like ribs of fan.

1–3-pinnate, 1–2.5 times length of trophophore, divided into several equally long branches (all other botrychiums have a single stalk or 1 dominant and 2 smaller).

pinnately branched or simple.

absent or of widely scattered, long, uniseriate hairs, especially on petioles and rachises.

=90.