Flora of North America species comparison

leaves to 2 × 0.7 mm; rarely hemiisophyllous;

hyaline cells non-ornamented, mostly nonseptate.

leaves triangular-lingulate, 0.8 mm or less;

apex entire or weakly denticulate, hyaline cells sometimes septate, efibrillose and aporose except near apex.

long and tapering to short and pointed, leaves loosely imbricate.

often short and blunt.

broadly ovate, to 2 × 1 mm or more wide, broadly ovate, hyaline cells non-ornamented, convex surface with round to elliptic pores along the commissures; chlorophyllous cells short-elliptic in transverse section and well-enclosed on both surfaces.

dioicous.

dioicous.

with numerous pseudostomata.

exserted, with few pseudostomata.

22–30 µm; roughly papillose to nearly smooth, with distinct Y-mark sculpture on distal surface;

proximal laesura 0.5–0.8 spore radius.

30–35 µm; finely papillose on both surfaces, distinct bifurcated Y-mark sculpture on distal surface;

proximal laesurae more than 0.5 spore radius.

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

branch stems with hyaline cells non-ornamented;

no or weak funnel-like projections on the interior end walls, large round pores on superficial cell walls.

fascicles with 2–3 spreading and 2–3 pendent branches Branch leaves broadly ovate, subsecund, hyaline cells on convex surface with very numerous small pores (18–40 per cell) in a continuous row along the commissures, concave surface usually aporose.