Flora of North America species comparison

leaves to 1.7 × 1 mm, occasionally longer; rarely hemiisophyllous;

hyaline cells non-ornamented, nonseptate.

leaves triangular-lingulate to broadly lingulate, 0.9–1.3 mm, apex broadly rounded to obtusely angled, border very strong and broad at base (more than 0.4 width);

hyaline cells rhombic, efibrillose, most 0–1-septate.

long and tapering, leaves ± imbricate to spreading in shade forms.

long, tapering, imbricate, not 5-ranked.

broadly ovate, 2.2 × 1.3 mm, hyaline cells non-ornamented, convex surface with elliptic pores along the commissures, chlorophyllous cells isosceles-triangular to ovate-triangular in transverse section and just enclosed to just exposed on the convex surface;

end wall not thickened.

ovate, 2–2.5 mm, concave, straight, apex involute;

hyaline cells on convex surface with elliptic pores along the commissures grading from moderate-sized pores near leaf apex to large pores at the base, concave surface with large round pores in proximal portions of leaf.

dioicous.

monoicous.

with numerous pseudostomata.

24–33 µm, surface finely papillose to smooth, distal surface with distinct bifurcated Y-mark sculpture;

proximal laesura more than 0.6 spore radius.

23–31 µm, irregularly coarsely papillose on both surfaces;

proximal laesura less than or equal to 0.5 spore radius

fascicles with 2 spreading and 2 pendent branches.;

branch stems with hyaline cells non-ornamented;

no or weak funnel-like projections on the interior end walls, often with 1 large pore per cell on superficial cell walls.

fascicles with 2 spreading and 1–2 pendent branches.