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 equilateral triangular, 0.8–1.1 mm; often spreading;

apex more or less obtuse;

leaves often spreading;

hyaline cells usually septate and often fibrillose in proximal half of leaf.

weakly to strongly 5-ranked.

unranked, ± straight, leaves moderately elongated at distal end.

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.

ovate-lanceolate, less than 2.2 mm, straight; undulate and sharply recurved when dry;

margins entire;

hyaline cells on convex surface with 0–1 apical pores and often with pseudopores, concave surface with to 12 round wall thinnings in cell angles and sometimes along commissures; chlorophyllous cells triangular in transverse section, just enclosed on the concave surface and broadly exposed on the convex surface.

dioicous.

unknown.

18–33 µm, coarsely papillose on both surfaces;

proximal laesura less than 0.4 spore radius.

not seen.

fascicles with 2 spreading and 1–2 pendent branches.

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

branch stems green, with cortex enlarged with conspicuous retort cells.