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 1.1 × 1 mm; rarely hemiisophyllous;

hyaline cells non-ornamented, frequently septate.

weakly to strongly 5-ranked.

clavate and rounded 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.

broadly ovate, 2.4 × 1.7 mm;

hyaline cells on convex surface with numerous round pores along the commissures, comb-lamellae on hyaline cell walls where overlying chlorophyllous cells; chlorophyllous cells broadly triangular in transverse section and well-enclosed on the convex surface.

dioicous.

dioicous.

with pseudostomata.

18–33 µm, coarsely papillose on both surfaces;

proximal laesura less than 0.4 spore radius.

22–29 µm; finely papillose on both surfaces;

indistinct triradiate ridge on distal surface;

proximal laesura 0.5–0.6 spore radius.

fascicles with 2 spreading and 1–2 pendent branches.

fascicles with 2 spreading and 2 pendent branches.;

branch stems with hyaline cell comb-lamellae visible on interior cortex wall, cortical cell end walls with conspicuous funnel projections more than 1/2 length of cell, superficial cortical wall aporose.