Trematodon longicollis Michx., Fl. Bor. Amer. 2: 289. 1803. Type. U.S.A., North Carolina, in arenosis Carolinae, Michaux.
Plants scattered, yellow-green, terricolous, 3–5 mm long. Leaves evenly spaced, flexuous spreading when wet, clasping, oblong to oblong-ovate at base, gradually long linear-subulate above, 2–3 mm long; margins weakly recurved above, entire below, weakly denticulate by blunt teeth above; costa percurrent; upper cells short-rectangular, walls firm and thickened; basal cells laxly oblong-rhomboidal to long rectangular, pale whitish yellow. Autoicous. Setae 10–15 mm long, smooth, yellow; capsules inclined, yellow, urn ellipsoidal 1.5–2.0 mm long, neck 3.0–4.0 mm long; annuli deciduous, revoluble; opercula rostrate, 1.0 mm long; stomata crytoporic and phaneroporic stomata; peristome teeth red, lanceolate, vertically striate. Spores densely papillose or minutely warty.