Flora of North America species comparison

leaves erect-appressed or sometimes erectopatent, closely to loosely imbricate, ovate to ovate-triangular, broadest at 1/9–1/5 leaf length, slightly to occasionally strongly concave, not to weakly plicate, 1.8–3 × 0.8–1.6 mm;

base rounded, broadly or sometimes narrowly decurrent;

margins plane, often recurved proximally, occasionally elsewhere, serrulate to serrate;

apex short to moderately acuminate;

costa to 50–75% leaf length, moderately strong, terminal spine absent, sometimes small tooth present;

alar cells short-rectangular, enlarged, 30–45 × 18–23 µm, walls thin, region conspicuous, of 5–10 × 5–10 cells, pellucid;

laminal cells linear, 60–140 × 7–11 µm;

basal cells to 11–14 µm wide, region in 2–4 rows.

with base often asymmetric;

margins usually recurved below broadest part of leaf.

reddish orange, 1.5–2.5(–3) cm, rough.

autoicous.

strongly inclined to horizontal, red-brown, ovoid to elongate, curved, 2–2.5 mm;

annulus separating by fragments;

operculum conic.

12–18 µm.