Flora of North America species comparison

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.

leaves triangular to triangular-lingulate, 0.9–1.1 mm; appressed to spreading;

apex apiculate, acute or narrowly obtuse, appressed to spreading;

hyaline cells nonseptate and efibrillose.

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

straight to more typically curved, typically stout and blunt ended; strongly 5-ranked, leaves not much elongate at distal end.

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.

ovate to ovate-lanceolate, 1.4–1.8 mm; straight to often subsecund; weakly undulate and slightly recurved;

hyaline cells on convex surface with 1 pore per cell at apical end of cell, on concave surface with round wall thinnings in the cells ends and angles; chlorophyllous cells triangular to triangular-ovate in transverse section, very well-enclosed within concave surface.

dioicous.

dioicous.

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

25–28 µm; roughly papillous on both surfaces;

proximal laesura more than 0.5 the length of the spore.

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

branch stems green, cortex enlarged with conspicuous retort cells.

fascicles with 2 spreading and 2 pendent branches.;

branch stems green but often reddish at proximal end, with cortex enlarged with conspicuous retort cells.