Flora of North America species comparison

leaves triangular-ovate, more than 1.2 mm, usually appressed;

apex acute to apiculate, hyaline cells rarely septate or porose, apical region often fibrillose.

red-tinged, cortex eporose.;

stem leaves triangular-lingulate to lingulate with a more or less obtuse apex, 0.8–1.05 × 0.5–0.55 mm;

border strongly developed at the base;

hyaline cells rhomboid and 0–1-septate, efibrillose and eporose.

mostly unranked to weakly 5-ranked, often conspicuously falcate, leaves greatly elongated at distal end.

with leaves 5-ranked and loosely spreading.

ovate-lanceolate to lanceolate, 1.6–5 mm, falcate toward branch tips, when dry often undulate and recurved, rarely weakly serrulate along the margins in submerged forms, leaves from middle of spreading branches with length to width ratio less than or equal to 1:0.28;

hyaline cells length to width ratio in apical convex surface region 8:1 or more, convex surface with 0–1 small round pores at apex, 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 on the concave surface.

small, 1–1.2 × 0.3–0.35 mm;

convex surface with moderate-sized pores, grading from 4–6 µm near apex to more than 20 µm at base, concave surface eporose except for occasional large round pores in proximal side regions.

dioicous.

unknown.

29–38 µm; covered with large papillae on both surfaces, appearing pusticulate;

proximal laesura less than 0.5 spore radius.

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

branch stems green, but often pinkish at the proximal ends, with cortex enlarged with conspicuous retort cells.