Flora of North America species comparison

leaves to 1.2–2.2 × 0.8–1 mm; rarely hemiisophyllous;

hyaline cells non-ornamented, rarely septate, comb-lamellae absent.

pale green to pale brown;

superficial cortex of weakly to moderately differentiated.;

stem leaves triangular-lingulate, 0.9–1.3 mm; usually appressed;

apex obtuse and often erose;

hyaline cells efibrillose and nonseptate.

tapering, leaves spreading to somewhat imbricate.

tapering or in more robust forms, frequently blunt, straight to arcuate, leaves slightly to moderately elongated at distal end.

broadly ovate, to 1.7 × 1.5 mm;

hyaline cells non-ornamented, convex surface with elliptic to rarely round pores along the commissures; chlorophyllous cells lenticular to narrowly elliptical in transverse section, narrowly exposed on both ends, but more so on concave surface, end walls thickened at both ends.

ovate to ovate-lanceolate; more than 1.8 mm; straight, stiff, not much undulate and reflexed to recurved;

margins entire;

hyaline cells on convex surface with a few end pores, but mostly numerous small to very small (often barely visible) pores or wall thinnings free from the commissures, on concave surface similar, but with pores generally fewer and larger; chlorophyllous cells triangular in transverse section, just reaching concave surface or slightly enclosed.

dioicous.

dioicous.

with inconspicuous pseudostomata.

23–30 µm;

surface finely roughened to smooth;

laesura on proximal surface more than 0.5 spore radius.

18–27 µm;

both surfaces covered with rough, irregular verrucate plates of papillae, bifurcated Y-mark sculpture on distal surface;

proximal laesura less than 0.5 spore radius.

fascicles with 2 spreading and 1–2 pendent branches.;

branch stems with cortical cells non-ornamented, no or weak funnel-like projections on the interior end walls, often with large round pores on the superficial walls.

fascicles with 2 spreading and 2 pendent branches.;

branch stems green, with cortex enlarged with conspicuous retort cells.