Bryologist 89: 200. 1986,.
Stems 2–5 mm. Leaves 1–2.5 mm, distal laminal cells mostly isodiametric, 1: 1, with a few cells 2: 1 or transversely elongate, areolation somewhat irregular, proximal cells longer. Seta 0.5–2 mm, flexuose when dry. Capsule spherical to short-ovate, 0.4–0.6 mm. Peristome absent. Spores 6–10 µm.
Habitat: Moist, acidic boulders, montane, predominantly alpine
B.C., Alaska, Oreg., Wash., e Asia (Japan)
The spherical or short-ovate capsules absent peristome teeth and the somewhat shorter distal laminal cells distinguish Brachydontium olympicum from B. trichodes. This is a circum-North Pacific montane species, which should be sought for in coastal areas of Siberia.