Flora of North America species comparison

leaves lingulate-triangular to lingulate, 1–1.4 mm, apex broadly rounded but becoming acute in hemiisophyllous forms, border strongly developed at base (more than 0.25 width);

hyaline cells rhombic and 0–3-septate with some cells in leaf midregion 2–septate.

leaves to 1.2–2.2 × 0.8–1 mm; rarely hemiisophyllous;

hyaline cells non-ornamented, rarely septate, comb-lamellae absent.

weakly to strongly 5-ranked.

tapering, leaves spreading to somewhat imbricate.

ovate to ovate-lanceolate, 0.9–1.2 mm, concave, subsecund on some branches, apex involute;

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

broadly ovate, to 1.7 × 1.5 mm;

hyaline cells non-ornamented, convex surface with elliptic to rarely round pores along the commissures; chlorophyllous cells lenticular to narrowly elliptical in transverse section, narrowly exposed on both ends, but more so on concave surface, end walls thickened at both ends.

dioicous.

dioicous.

with inconspicuous pseudostomata.

18–33 µm, coarsely papillose on both surfaces;

proximal laesura less than 0.4 spore radius.

23–30 µm;

surface finely roughened to smooth;

laesura on proximal surface more than 0.5 spore radius.

fascicles with 2 spreading and 1–2 pendent branches.

fascicles with 2 spreading and 1–2 pendent branches.;

branch stems with cortical cells non-ornamented, no or weak funnel-like projections on the interior end walls, often with large round pores on the superficial walls.