Plants 2-20 mm, perennial, gregarious or in dense short turfs, green or yellow-green. Stems simple to branched by several sterile innovations to 15 mm, becoming prostrate with age. Stem leaves erect to erect-spreading, ovate-lanceolate to lanceolate or triangular, acuminate to subulate, 0.5-2.5 mm; costa strong, percurrent to short-excurrent, sometimes long-excurrent in long subulate tip; laminal margins plane, smooth or finely serrulate distally; median laminal cells rhomboidal to linear-rhomboidal, 5-15:1, 45-160 × 8-14 µm, becoming somewhat shorter distally, proximal cells rectangular, 3-8:1, 45-90 × 9-18 µm, cells in alar region short-rectangular to quadrate, 1-2:1, in 2-3 rows extending from 3-10 cells distally from base along margin; leaves of innovations similar to stem leaves but smaller, gradually reduced proximally. Perichaetial leaves erect, concave, sometimes flexuose, ovate-lanceolate, acuminate to strongly subulate, laminal cells similar to stem leaves except proximal and alar cells long-rectangular, 6-10:1, 90-140 × 14-20 µm, distinctly hyaline, at least in alar region. Specialized asexual reproduction occasional, of filiform uniseriate rhizoidal tubers. Sexual condition paroicous; antheridia typically naked or occasionally 1-2 small bracts present. Capsule terminal, sometimes appearing lateral due to rapid innovation growth, 300-800 µm. Spores typically 16 (8-36) per capsule, rounded to polyhedral, 120-260 µm, smooth or finely papillose, pale yellow to golden.