Flora of North America species comparison

leaves triangular, large, less than 1.7 mm, mostly appressed to stem, apex weakly apiculate to narrowly obtuse;

hyaline cells efibrillose and seldom to often septate at base and sides.

leaves broadly ovate, 3.5–4 mm, apex rounded and indistinctly toothed;

hyaline cells on convex surface with 10–20 small (2.5–7.5 µm) round pores approximately 1/6 the diameter of the hyaline cells along the commissures, cells on concave surface uniporose in distal end or aporose, sometimes one or a few pores are scattered over the surface of the cells.

unranked, long and tapering, leaves greatly elongate at distal end.

few, single and short or more commonly none.

ovate-lanceolate to lanceolate in aquatic forms, ovate to ovate-lanceolate in emergent forms, greater than 2.5 mm, often falcate-secund, especially in submerged forms, weakly undulate and recurved when dry;

margin entire, hyaline cells on convex surface with 0–1 pores per cell, concave surface with round wall thinnings in the cell apices and angles; chlorophyllous cells narrowly triangular in transverse section and well-enclosed on the concave surface.

if any, are usually slightly smaller, 2–3 mm, but otherwise identical to the stem leaves.

dioicous.

dioicous.

immersed in perichaetial leaves, pseudopodium extremely short, without pseudostomata.

25–40 µm; coarsely papillose on both surfaces;

proximal laesura more than 0.5 the length of the spore

fascicles with 2 spreading and 2 pendent branches.;

branch stem green, cortex enlarged with conspicuous retort cells.

fascicles, if any, usually only 1 single branch.

not seen.