Flora of North America species comparison

leaves to 2 × 0.7 mm; rarely hemiisophyllous;

hyaline cells non-ornamented, mostly nonseptate.

leaves to 1.7 × 1.2 mm; rarely hemiisophyllous;

hyaline cells nonseptate to occasionally septate, comb-lamellae absent.

long and tapering to short and pointed, leaves loosely imbricate.

long and tapering.

broadly ovate, to 2 × 1 mm or more wide, broadly ovate, hyaline cells non-ornamented, convex surface with round to elliptic pores along the commissures; chlorophyllous cells short-elliptic in transverse section and well-enclosed on both surfaces.

broadly ovate, to 3 × 2.3 mm;

hyaline cells on proximal half of convex surface with elliptical pores along the commissures, often with ridges running parallel to long leaf axis on hyaline cell surface overlying chlorophyllous cells; chlorophyllous cells elliptical and just enclosed on both surfaces in transverse section;

end walls not thickened.

dioicous.

dioicous.

with numerous pseudostomata.

not seen.

22–30 µm; roughly papillose to nearly smooth, with distinct Y-mark sculpture on distal surface;

proximal laesura 0.5–0.8 spore radius.

unknown.

fascicles with 2–3 spreading and 2–3 pendent branches.;

branch stems with hyaline cells non-ornamented;

no or weak funnel-like projections on the interior end walls, large round pores on superficial cell walls.

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 large round pores on the superficial wall.