Flora of North America species comparison

leaves ovate-lanceolate to ovate-triangular;

basal laminal cells short-rectangular, often pigmented, walls firm, eporose, region weakly differentiated;

medial cells 2–7:1.

leaves 0.6–2 × 0.3–0.8 mm, lamina 1-stratose;

margins entire or nearly so to serrate;

costa to mid leaf, percurrent, or rarely short-excurrent, narrower than 100 µm at base;

medial laminal cells 10–60 × 5–15 µm.

dark red, 1.2–2.2 cm.

constricted below mouth when dry;

exothecial cells long- to short-rectangular, 30–105 × 18–35 µm, walls firm, not collenchymatous;

annulus separating, 2–4-seriate, cell walls thin;

operculum acute, apiculate, or rostrate;

exostome teeth yellow-brown, external surface cross striolate basally, coarsely papillose distally, internal surface trabeculate;

endostome basal membrane high, segments not or narrowly perforate.

finely papillose.