Flora of North America species comparison

leaves ± catenulate when dry, not homomallous, ovate, abruptly narrowed to apex, concave, not plicate, 0.4–1.2 mm, 1.5–2:1;

base flaring;

margins plane or rarely recurved proximally, entire;

apex short-acuminate, sometimes falcate;

costa usually double, or single, 2-fid, or sometimes ecostate, weak, not reaching mid leaf;

medial laminal cells 1–2(–3):1, walls firm, not incrassate.

leaves not catenulate when dry, not homomallous, ovate, gradually or abruptly narrowed to apex, concave, strongly and distinctly 2-plicate, 0.6–1.5(–2) mm, 3:1;

base flaring, cordate;

margins recurved to mid leaf or beyond on one or both sides, distinctly serrulate distally;

apex short-acuminate to acuminate, often falcate;

costa single, strong, reaching mid leaf to percurrent;

medial laminal cells 2(–3):1, walls firm, not incrassate.

ovate to suborbicular, 0.4–0.8 mm;

laminal cell walls moderately incrassate.

ovate to ovate-lanceolate, 0.4–0.8 mm;

laminal cell walls thick.

red-brown, 0.1–0.2 cm.

red-brown, 0.1–0.2 cm.

inclined, subcylindric, asymmetric, 1.5–2.5(–3) mm.

inclined, subcylindric, asymmetric, 1–2 mm.

10–18 µm.

10–16 µm.

leaves broadly ovate or suborbicular.

leaves broadly ovate or suborbicular.