Acaulon granulosum

Dioicous or monoicous. Plants simple, 1.5–2 mm tall, pale yellowish green to brown. Leaves broadly ovate, concave; inner leaves larger than outer, convolute, orbicular; apex cuspidate, recurved; costa weak, usually excurrent as a recurved arista; margin entire toward base, irregularly crenulated or dentate toward apex; laminal cells 30–60 μm long, 15–25 μm wide with narrower rhombic to oblong-rhombic or irregularly hexagonal marginal cells. Seta 0.09–0.12 mm long, straight. Capsules globose, c. 0.6 mm wide, apiculate, ferrugineous to dark brown. Spores spherical or short-ellipsoidal, very coarsely granular, 50–65 μm diam.