Ptychomitrium australe

Cushions to c. 20 mm tall on rocks. Stems covered in brown rhizoids, usually branched. Leaves ligulate-subualte from ovate base, distinctly shouldered, mostly 3–4.5 mm long, plane to abaxially keeled, strongly convoluted when dry and upper lamina involute; costa subpercurrent; apex obtuse, often cucullate; margins entire, plane, bistratose in apical half or more, without a distinct border; cells in apical half quadrate to shortly rectangular, mostly 7–13 μm long, 6–7 μm wide, bistratose throughout; cells near base rectangular 19–56 μm long, 7–14 μm wide. Seta 2–6 mm long, yellow or yellow-brown. Capsules oblong-ovoid, to c. 1.7 mm long. Operculum c. 1 mm long, long-rostrate from almost flat base.