Flora of North America species comparison

leaves quite variable in shape, elongate-lingulate to ovate, broadest above the middle, 1.9–2.5 mm, slightly concave, straight;

apex broad and toothed;

hyaline cells narrowly rhomboid, 0–1-septate, distal portion fibrillose, convex surface with membrane pleats, concave surface with 1(2–3) oblong membrane gaps.

leaves to 1.2 × 0.8 mm; rarely hemiisophyllous;

hyaline cells mostly nonseptate, comb-lamellae usually absent, but sometimes weak.

rarely 5-ranked.

short and blunt-tipped, leaves spreading.

ovate, 1.6–2.2 mm, concave, straight;

apex stiffly involute and broadly truncate with up to 8 teeth, border denticulate due to cell wall resorption and projecting cell walls;

hyaline cells strongly bulging on convex surface and nearly plane on the concave surface, convex surface with narrowly elliptic pores along commissures grading from smaller pores near the apex to large rounded pores at base, concave surface with large round pores in proximal regions of leaf.

ovate to ovate-elliptical, 1.6–2.2 × 1 mm;

hyaline cells on proximal half of convex surface with round to elliptic pores along the commissures;

comb-lamellae on hyaline cell wall where overlying chlorophyllous cells; chlorophyllous cells broadly triangular in transverse section and well-enclosed on convex surface, end wall not thickened.

monoicous.

dioicous.

unknown.

27–33 µm, finely papillose on both surfaces with distinct bifurcated Y-mark sculpture on distal surface;

proximal laesura less than 0.5 spore radius.

unknown.

fascicles with 2 spreading and 1–2 pendent branches.

fascicles with 2 spreading and 1 pendent branch.;

branch stems with hyaline cells non-ornamented, no or weak funnel-like projections on the end walls of cortical cells, cortical cell walls usually with large round pores.