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 lingulate, 1–1.2 mm, apex entire to somewhat erose;

hyaline cells non-septate;

fibrillose and porose in apical region.

rarely 5-ranked.

slender with small spreading leaves.

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-lanceolate, 1.4–1.6 mm, straight to slightly subsecund, weakly undulate, often recurved in capitulum branches;

hyaline cells on convex surface with up to 5 small round faint pores per cell in the basal portion of the cell and free from the cell margins, concave surface aporose.

monoicous.

unknown.

not seen.

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.

not seen.

fascicles with 2 spreading and 1–2 pendent branches.

fascicles with 2 spreading and 2 pendent branches.