Neckera undulata Hedwig, Sp. Musc. Frond., 201. 1801

Stem leaves spreading to squarrose, undulate-lunate when dry or moist, oblong-ligulate, 1.5-2(-3) mm; base strongly ovate-auriculate; costa 3/4 leaf length. Sexual condition autoicous or sometimes synoicous.

Capsules mature winter-summer. Limestone rock, tree trunks, logs; low elevations (0-70 m); Fla.; Mexico; West Indies; Central America; South America.

Neckeropsis undulata is easily recognized by the leaves that are lunate-undulate moist or dry, with a truncate apex and a broadly auriculate base. Outside the flora area, the species occurs from lowland to lower montane forests, from sea level to 1800 m.