Austinia tenuinervis Müll. Hal., Linnaea 39: 439. 1875. Type: ?
Plants forming mats, glossy green. Stems creeping, several branched; in cross-section cells similar, rather thick-walled, central strand absent. Leaves erect to erect-spreading, ovate-short lanceolate, to 0.4 mm long, apex mostly short acuminate, base short decurrent; margins plane, serrulate-dentate above base; costa short, ca. 1/3 lamina length; laminal cells smooth, upper and median cells rhombic to oblong-rhomboidal; alar cells in 2-3 rows extending to below widest part of leaf, subquadrate; marginal cells mostly narrower and smaller. Perichaetial leaves narrowly lanceolate, costa present or absent. Setae to 5 mm long, smooth. Capsules erect to suberect, urn short-cylindrical, 0.75–0.85 mm long; opercula, long rostrate; peristome single, endostome basal membrane absent, segments 16, variously perforate, faintly papillose, appearing smooth. Calyptrae smooth or slightly roughened distally, naked or with a few hairs.