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 triangular-lingulate to lingulate; 0.7–0.8 mm;

apex rounded and often erose, hyaline cells nonseptate or sometimes 1-septate, numerous small round pores more than 2 µm along the commissures and scattered across the cell on the convex surface, on the concave surface fewer similar-sized pores along the commissures.

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

short and slightly curved Branch fascicles with 2 spreading and 2 pendent branches.

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, 1.1–1.3 mm, distinctly curved to secund;

hyaline cells covered with numerous (more than 30 per cell) tiny pores (ca. 1 µm) on convex surface along the commissures and across the cell surface, sometimes forming several linear rows of free pores, on concave surface with fewer pores round to oval and slightly larger (more than 2 µm) restricted to commissures.

monoicous.

probably dioicous.

not seen.

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.

not seen.

stems green;

cortex enlarged, with conspicuously long-necked retort cells.