Flora of North America species comparison

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

hyaline cells non-septate;

fibrillose and porose in apical region.

leaves long triangular-ovate, 1–2 mm; usually appressed;

apex acute to apiculate, hyaline cells only rarely septate or aporose but often fibrillose in apical region.

slender with small spreading leaves.

unranked, straight to slightly curved, leaves somewhat elongated at distal end.

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.

1.5–2.7 mm, ovate-lanceolate to lanceolate; straight to falcate toward branch tips; when dry often undulate and lightly recurved, margins entire to rarely weakly toothed along the margins in flaccid aquatic forms, hyaline cells on convex surface with 0–1 small round pores at apex, on concave surface with faint round wall thinnings in cell apices and angles; chlorophyllous cells triangular to trapezoidal in transverse section, broadly exposed on the convex surface and exposed slightly to broadly on the concave surface.

unknown.

dioicous.

not seen.

not seen.

30–43 µm; the superficial surface coarsely papillose to papillose reticulate.

fascicles with 2 spreading and 2 pendent branches.

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

branch stems green, cortex enlarged with conspicuous retort cells.