Acaulon integrifolium

Plants minute, 1–2.5 mm tall, gregarious or scattered, pale green when young, appearing bleached when old. Leaves weakly spreading when moist, strongly appressed when dry, ovate or broadly ovate to rotundate, 0.5–1.75 mm long, concave; apex acute; costa subpercurrent to percurrent, occasionally excurrent in a mucro, not markedly recurved; margin entire, plane; laminal cells in the apical half subquadrate to rhomboidal, 12–15 μm wide; basal cells rectangular, hyaline. Seta to 0.2 mm long. Capsules globose, 0.45–0.8 mm wide, orange-brown. Spores spherical, finely papillose, 25–50 μm diam.