Flora of North America species comparison

leaves ovate-lingulate; 1–1.3 mm, apex broadly rounded;

hyaline cells nonseptate, aporose and fibrillose in at least distal half of leaf.

leaves lingulate to triangular-lingulate, 0.9–1.2 mm, apex rounded, usually 1/3–1/2 of leaf fibrillose;

hyaline cells usually fibrillose in distal 1/3–1/2 of leaf, on convex surface near apex with 1–3 pores per cell, on concave surface near apex 1–4 pores per cell.

2–3 spreading and 2 pendent leaves not much elongated at distal end.

arched but rarely curved and contorted.

ovate, 1–1.5 mm; straight;

not or weakly undulate or recurved when dry;

margins entire;

hyaline cells short and wide, convex surface with 1–3 small pores per cell and on concave surface with large round wall thinnings in the cell angles; chlorophyllous cells equilateral-triangular in transverse section, broadly exposed on convex surface and just reaching to well-enclosed on concave surface.

ovate, 1–1.5 mm, straight to slightly subsecund;

hyaline cells of convex surface with numerous ringed pores along the commissures (12–22 per cell), 0–3 pores per cell on the concave surface.

monoicous.

with few pseudostomata.

27–42 µm;

both surfaces smooth, proximal surface with distinct bifurcated Y-mark sculpture surrounded by distinct circular border, distal surface with distinct raised border around margins;

proximal laesura usually less than 0.4 spore radius.

30–37 µm; finely papillose on both surfaces, indistinct raised Y-shaped sculpture on distal surface;

proximal laesura 0.5 spore radius or less.

stems green;

cortex enlarged, with conspicuously long-necked retort cells.

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