Stems: with branches often flagellate. Leaves: shrunken when dry, erectopatent when moist, concave, 1–1.5 × 2–3 mm; costa sometimes 2-fid. Perichaetia: terminal on axillary branches. Seta: hyaline, very slender. Capsule: 1.5–2 × 0.5–1 mm including hypophysis; columella included; exostome teeth of 2 layers of cells, short, truncate. Spores: yellow-green. Phenology: Capsules mature summer.
Dung, animal remains. low to moderate elevations. Greenland, Man., Nfld. and Labr. (Labr.), N.W.T., Nunavut, Que., Alaska, n Eurasia.
Aplodon wormskioldii can be distinguished by the hyaline, slender and twisted seta. The gametophyte differs from other species of Splachnaceae in having shorter and much wider apical cells and a wider marginal row of laminal cells.