Flora of North America species comparison

leaves lingulate-spatulate, large, 1.3–1.6 mm; appressed to stem;

apex very broad and lacerate;

hyaline cells efibrillose and aporose, often septate.

leaves lingulate to ovate-lingulate, 1.3–2 mm;

apex truncate to rounded, usually denticulate;

hyaline cells typically fibrillose for 1/2 of leaf or more, often 1–2-septate, convex surface with 4–12 or more pores per cell along the commissures, concave surface with fewer pores.

strongly 5-ranked and straight.

usually curving, often large and tumid.

ovate-lanceolate, 1.5–3 mm; straight to slightly subsecund; imbricate to somewhat reflexed and not undulate;

margins entire;

hyaline cells long and narrow, length to width ca. 10:1 on convex surface with 1 or more small pores in the cell ends and angles and often with numerous pseudopores along the margins, on concave surface with large round wall thinnings on the cell ends and angles; chlorophyllous cells triangular to trapezoidal in transverse section, apex often exposed on concave surface.

broadly ovate to ovate-lanceolate, 1.3–2.5 mm, greatly elongated in aquatic forms, straight or infrequently subsecund or subsquarrose;

hyaline cells with 10–22 pores along the commissures on the convex surface, no or fewer pores per cell (1–8) on the concave surface.

monoicous or dioicous.

dioicous.

exserted, with few pseudostomata.

22–34 µm;

both surfaces smooth, apparent ridged border on proximal surface;

proximal laesura more than 0.5 spore radius.

27–34 µm; finely papillose on both surfaces, with distinct raised Y-mark sculpture (indistinctly bifurcated Y-mark) on the distal surface;

proximal laesura less than 0.5 spore radius.

fascicles with 2 spreading and 2 pendent branches, leaves not much elongated at distal end.;

branch stems green, with cortex enlarged with retort cells.

fascicles with 2(rarely 3) spreading and 1–2(–3) pendent branches.