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 triangular-lingulate, 0.8 mm or less;

apex entire or weakly denticulate, hyaline cells sometimes septate, efibrillose and aporose except near apex.

weakly to strongly 5-ranked.

often short and blunt.

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.

dioicous.

dioicous.

exserted, with few pseudostomata.

18–33 µm, coarsely papillose on both surfaces;

proximal laesura less than 0.4 spore radius.

30–35 µm; finely papillose on both surfaces, distinct bifurcated Y-mark sculpture on distal surface;

proximal laesurae more than 0.5 spore radius.

fascicles with 2 spreading and 1–2 pendent branches.

fascicles with 2–3 spreading and 2–3 pendent branches Branch leaves broadly ovate, subsecund, hyaline cells on convex surface with very numerous small pores (18–40 per cell) in a continuous row along the commissures, concave surface usually aporose.