Hymenoloma antarcticum

Paroicous. Tufts or cushions on rock, dull brown-green. Stems 15–25 (–45) mm long, dichotomously branched, orange-brown, with sparse dark brown rhizoids at base or in leaf axils. Leaves erect-spreading, sometimes ± falcate when moist, strongly cork-screwed when dry, subulate from ovate base, 1.5–4.5 mm long, 0.2–0.8 mm wide, strongly concave to tubulose; apex subulate, obtuse  or acute at tip; costa occupying less than 1/6 of leaf width at base, percurrent or shortly excurrent; margin entire, plane near base, incurved toward apex, without a border; laminal cells in apical half quadrate to short-rectangular, 5–20 μm long, 4–8 μm wide, with linear striations and appearing papillose, unistratose, gradually transitioning to basal laminal cells at base of subula; basal laminal cells rectangular to linear, 10–105 μm long, 3–8 μm wide, smooth; alar cells ± inflated, quadrate to hexagonal, 15–33 μm long, 5–15 μm wide, forming a strongly differentiated and weakly auriculate group extending to the costa or sometimes not or weakly differentiated. Perichaetial leaves 2–2.5 mm long, with subula 1/3–1/2 leaf length. Seta 3–15 mm long, yellow or pale yellow-brown, smooth, not twisted or slightly twisted clockwise. Capsule erect to inclined, subglobose, ovoid, short-cylindric or obovoid, 0.9–1.8 mm long, straight, light brown. Operculum obliquely long-rostrate, 1–1.2 mm long.