Flora of North America species comparison

long-creeping, branched, branches 2–3-forked, flat, not articulate, glabrous.

long-creeping, usually ascending, sparsely branched, branches mostly simple or 1-forked, flat, not articulate, glabrous.

delicate and papery.

delicate, papery.

paired, 0.6–1.1 cm;

sporophylls monomorphic, ovate-lanceolate, keeled, keel not dentate, base glabrous, margins green, entire or with a few scattered, short cilia, apex acute to acuminate.

solitary or paired, lax, flattened, 0.4–0.7(–1.5) cm;

sporophylls very strongly keeled, keel dentate, base slightly cordate to rounded, margins transparent, sparsely serrate, apex acuminate;

megasporophylls larger and wider than microsporophylls, usually on underside of strobili.

borne on underside of stems throughout stem length or restricted to proximal ± 2/3 of main stem or axillary throughout stem, 0.2–0.4 mm diam.

axillary, 0.1–0.2 mm diam.

leaves spreading or slightly ascending, distant, shiny green becoming shiny brown, with orange or red spot or entirely reddish, ovate to ovate-oblong or oblong, 1.5–3.2 X (1–)1.5–2.2 mm;

base auriculate, basiscopic auricle conspicuous, acroscopic auricle inconspicuous or base ± rounded;

margins green, ciliate toward auricles, otherwise entire;

apex rounded to obtuse or truncate.

leaves well spaced, green, ovate to ovate-lanceolate, 1.6–2.65 × 0.98–1.64 mm;

base slightly cordate;

margins transparent, serrate;

apex acute to slightly obtuse, conspicuously ending in teeth.

leaves ovate-oblong, (1.8–)2–2.2 × 1–1.3 mm;

base auriculate, outer auricle larger than inner one;

margins green, ciliate at auricles, otherwise entire;

apex abruptly cuspidate to bristled.

leaves spaced, ovate-lanceolate to narrowly ovate-lanceolate (on basal stems), 1.3–2 × 0.4–0.8 mm;

base oblique on inner side, rounded and prominent on outer side;

margins transparent, serrate;

apex long-acuminate to bristled.