Grimmia laevigata

Dioicous. Asexual propagules absent. Dense tufts or cushions on rocks, black and white, yellow-green at apices. Stems 0.5–2 cm long, with a central strand, light brown, with light brown rhizoids at base. Leaves spreading when moist, erect-appressed when dry, triangular or ovate to broadly ovate, 1–2 mm long, 0.4–0.6 mm wide, concave; apex obtuse to acuminate, with a dentate or rarely smooth hyaline hairpoint to 2 mm long; costa excurrent as a hairpoint; margins entire, plane, without a border; laminal cells in apical half mostly quadrate, 5–15 μm long, 5–13 μm wide, smooth, bistratose toward apex, gradually transitioning to basal laminal cells; cells near base oblate becoming rectangular near costa, 6–30 μm long, 10–30 μm wide, smooth. Setae 1–3 mm long, straight, yellowish, smooth, twisted anticlockwise. Capsules exserted, erect, oblong-ovoid to cylindric, straight, 1–1.5 mm long. Operculum short-rostrate, 0.25–0.4 mm long. Calyptra mitrate. Peristome present.